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Lots of people are looking for a Twitter alternative after Elon Musk bought the social media site last month, changed the site’s rules on impersonation, fired half of the site’s staff, and announced plans to sell “blue check” verification badges for $8 per month.

One of the fastest growing alternatives is Mastodon, which looks and feels a lot like Twitter.

But Mastodon isn’t a Twitter clone. It’s a free open-source platform, originally launched in 2016 by developer Eugen Rochko, and it’s made up of many different instances, or servers, instead of being managed by one company on one domain name.

This makes signing up and getting finding your friends a little bit harder.

There are also strange little quirks as well. Tweets are called “toots.” Retweets are called “boosts.” Because it’s an open-source project, it doesn’t have the same level of polish as social media sites like Twitter that are owned and operated by professionals.

Emails and loading can be slow. It’s a little bit like using Linux versus Windows or MacOS.

Mastodon has been growing fast. In the 12 days after Musk bought Twitter, Mastodon app downloads on Apple App Store and Google Play for Android surged more than 100 times previous rates to 322,000 installs during the period, according to analysis by Sensor Tower, an app analytics firm.

On Nov. 7, Mastodon founder Rochko tooted that there were over 1 million monthly active users of the service. That’s still a lot lower than the over 245 million daily active users of Twitter that CEO Elon Musk tweeted about this week.

Here’s what you need to know about Mastodon:

First, you need to pick a server, or instance

Because anyone can set up their own Mastodon server, there’s no central place to sign up like twitter.com. You have to find a server to sign up for. They’re known as “instances,” and you can think of them like e-mail providers.

A user on one instance can interact with users on other instances, including following, replying, and boosting. All instances taken together are called “the fediverse.” (The term comes from “federated,” which refers to the loosely connected way the servers work together — again, similar to email.)

Each instance has its own URL, which comes after your username, sort of like an email domain. There are over 5,000 instances, according to a site tracking Mastodon use, and they often follow a particular theme, such as geographical region or topic. Some require you to fill out a short application form with information like your interests or why you want to join that instance. Some servers are small and only for a small handful of friends.

There’s even a quiz that you can take to find which instance might be right for you.

The most popular instance is mastodon.online, which is also administered by the service’s founder. Bigger instances mean many of the best or shortest usernames on the server have already been taken. There’s also a list of instances you can join on Mastodon’s website.

Unlike Twitter, many of the instances that Mastodon runs on are not-for-profit, and some raise money for server costs and other expenses on sites like Patreon. It’s possible that some instances could stop operating because their administrators lose interest.

All instances have a feed just for people on that server that shows all toots posted in that instance in chronological order. But you can also just look at your personalized feed, which shows only toots from the people you follow — that’s the experience that’s most like Twitter.

Your username includes your server’s name

How to find friends

Mastodon can be a bit of a ghost town when you first log on, but there are a few ways to find your old favorite tweeters on the platform. Whether they post a lot is a different question.

One of the easiest ways to find people to follow is to search “Mastodon” on Twitter, where people who have created new accounts often post their new handles. Copy and paste it into the Mastodon search box to follow them.

Mastodon homepage is seen displayed on a mobile phone screen held by hand. It has been reported that more than 200.000 new users flocked the social media app after the takeover of Twitter by Elon Musk.

Musk’s Twitter takeover sent thousands flocking to Mastodon. Here’s what I discovered using the app

You can also copy and paste your Mastodon handle — with the @ symbol and domain — into your Twitter account to get your existing followers to try to join you.

There are several directories that list interesting people to follow on Mastodon.

If you’d like to try to follow the same people on Mastodon as you did on Twitter, there are several third-party apps that will try to import your follow list, although they require access to your Twitter account — be aware that you’re giving that information away to a third party.

Get tootin’

It’s time to get tooting. A first post that describes your interests or topics can help people find you.

Mastodon, like Twitter in its early days, gives users the choice to use different apps and interfaces to interact with toots and boosts.

Twitter migrants who miss TweetDeck, which displays several timelines on a desktop computer, should enable the Advanced Web Interface option in the settings to bring up a denser interface with multiple columns.

There are also several apps for iPhones and Android devices that work regardless of which instance you’re on. The main Mastodon apps work well, but there are lots of alternative clients.

Make sure to look through the settings for features that aren’t available on Twitter — like automatic post deletions and powerful block and muting features. A sensitive content feature can hide rants or NSFW posts behind a button. The latest version of Mastodon, 4.0, includes new abilities to follow hashtags, translate or edit posts, and additional content filters.

If you don’t like the instance you started on, it’s possible to export your account to another server.

Mastodon isn’t as easy to use as Twitter, nor does it have as many users generating content that will bring you back day after day. But its free, open-source approach with thousands of different servers guarantees that the platform can’t be bought for $44 billion.

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USDC stablecoin issuer Circle files for IPO as public markets open to crypto

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USDC stablecoin issuer Circle files for IPO as public markets open to crypto

Jeremy Allaire, Co-Founder and CEO, Circle 

David A. Grogan | CNBC

Circle, the company behind the USDC stablecoin, has filed for an initial public offering with the U.S. Securities and Exchange Commission.

The S1 lays the groundwork for Circle’s long-anticipated entry into the public markets.

While the filing does not yet disclose the number of shares or a price range, sources told Fortune that Circle plans to move forward with a public filing in late April and is targeting a market debut as early as June.

JPMorgan Chase and Citi are reportedly serving as lead underwriters, and the company is seeking a valuation between $4 billion and $5 billion, according to Fortune.

This marks Circle’s second attempt at going public. A prior SPAC merger with Concord Acquisition Corp collapsed in late 2022 amid regulatory challenges. Since then, Circle has made strategic moves to position itself closer to the heart of global finance — including the announcement last year that it would relocate its headquarters from Boston to One World Trade Center in New York City.

Read more about tech and crypto from CNBC Pro

Circle is best known as the issuer of USDC, the world’s second-largest stablecoin by market capitalization.

Pegged one-to-one to the U.S. dollar and backed by cash and short-term Treasury securities, USDC has roughly $60 billion in circulation.

Circle is best known as the issuer of USDC, the world’s second-largest stablecoin by market capitalization.

Pegged one-to-one to the U.S. dollar and backed by cash and short-term Treasury securities, USDC has roughly $60 billion in circulation. It makes up about 26% of the total market cap for stablecoins, behind Tether‘s 67% dominance. Its market cap has grown 36% this year, however, compared with Tether’s 5% growth.

Coinbase CEO Brian Armstrong said on the company’s most recent earnings call that it has a “stretch goal to make USDC the number 1 stablecoin.” 

The company’s push into public markets reflects a broader moment for the crypto industry, which is navigating renewed political favor under a more crypto-friendly U.S. administration. The stablecoin sector is ramping up as the industry grows increasingly confident that the crypto market will get its first piece of U.S. legislation passed and implemented this year, focusing on stablecoins.

Stablecoins’ growth could have investment implications for crypto exchanges like Robinhood and Coinbase as they integrate more of them into crypto trading and cross-border transfers. Coinbase also has an agreement with Circle to share 50% of the revenue of its USDC stablecoin.

The stablecoin market has grown about 11% so far this year and about 47% in the past year, and has become a “systemically important” part of the crypto market, according to Bernstein. Historically, digital assets in this sector have been used for trading and as collateral in decentralized finance (DeFi), and crypto investors watch them closely for evidence of demand, liquidity and activity in the market.

More recently, however, rhetoric around stablecoins’ ability to help preserve U.S. dollar dominance – by exporting dollar utility internationally and ensuring demand for U.S. government debt, which backs nearly all dollar-denominated stablecoins – has grown louder.

A successful IPO would make Circle one of the most prominent crypto-native firms to list on a U.S. exchange — an important signal for both investors and regulators as digital assets become more entwined with the traditional financial system.

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Hims & Hers shares rise as company adds new weight-loss medications to platform

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Hims & Hers shares rise as company adds new weight-loss medications to platform

The Hims app arranged on a smartphone in New York on Feb. 12, 2025.

Gabby Jones | Bloomberg | Getty Images

Hims & Hers Health shares closed up 5% on Tuesday after the company announced patients can access Eli Lilly‘s weight loss medication Zepbound and diabetes drug Mounjaro, as well as the generic injection liraglutide, through its platform.

Zepbound, Mounjaro and liraglutide are part of the class of weight loss medications called GLP-1s, which have exploded in popularity in recent years. Hims & Hers launched a weight loss program in late 2023, but its GLP-1 offerings have evolved as the company has contended with a volatile supply and regulatory environment.

Lilly’s weekly injections Zepbound and Mounjaro will cost patients $1,899 a month, according to the Hims & Hers website. The generic liraglutide will cost $299 a month, but it requires a daily injection and can be less effective than other GLP-1 medications.

“As we look ahead, we plan to continue to expand our weight loss offering to deliver an even more holistic, personalized experience,” Dr. Craig Primack, senior vice president of weight loss at Hims & Hers, wrote in a blog post.

A Lilly spokesperson said in a statement that the company has “no affiliation” with Hims & Hers and noted that Zepbound is available at lower costs for people who are insured for the product or for those who buy directly from the company. 

In May, Hims & Hers started prescribing compounded semaglutide, the active ingredient in Novo Nordisk‘s GLP-1 weight loss medications Ozempic and Wegovy. The offering was immensely popular and helped generate more than $225 million in revenue for the company in 2024.

But compounded drugs can traditionally only be mass produced when the branded medications treatments are in shortage. The U.S. Food and Drug Administration announced in February that the shortage of semaglutide injections products had been resolved.

That meant Hims & Hers had to largely stop offering the compounded medications, though some consumers may still be able to access personalized doses if it’s clinically applicable. 

During the company’s quarterly call with investors in February, Hims & Hers said its weight loss offerings will primarily consist of its oral medications and liraglutide. The company said it expects its weight loss offerings to generate at least $725 million in annual revenue, excluding contributions from compounded semaglutide.

But the company is still lobbying for compounded medications. A pop up on Hims & Hers’ website, which was viewed by CNBC, encourages users to “use your voice” and urge Congress and the FDA to preserve access to compounded treatments.

With Tuesday’s rally, Hims and Hers shares are up about 27% in 2025 after soaring 172% last year.

WATCH: Hims & Hers shares tumble over concerns around weight-loss business

Hims & Hers shares tumble over concerns around weight-loss business

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Meta’s head of AI research announces departure

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Meta's head of AI research announces departure

Meta CEO Mark Zuckerberg holds a smartphone as he makes a keynote speech at the Meta Connect annual event at the company’s headquarters in Menlo Park, California, on Sept. 25, 2024.

Manuel Orbegozo | Reuters

Meta’s head of artificial intelligence research announced Tuesday that she will be leaving the company. 

Joelle Pineau, the company’s vice president of AI research, announced her departure in a LinkedIn post, saying her last day at the social media company will be May 30. 

Her departure comes at a challenging time for Meta. CEO Mark Zuckerberg has made AI a top priority, investing billions of dollars in an effort to become the market leader ahead of rivals like OpenAI and Google.

Zuckerberg has said that it is his goal for Meta to build an AI assistant with more than 1 billion users and artificial general intelligence, which is a term used to describe computers that can think and take actions comparable to humans.

“As the world undergoes significant change, as the race for AI accelerates, and as Meta prepares for its next chapter, it is time to create space for others to pursue the work,” Pineau wrote. “I will be cheering from the sidelines, knowing that you have all the ingredients needed to build the best AI systems in the world, and to responsibly bring them into the lives of billions of people.”

Vice President of AI Research and Head of FAIR at Meta Joelle Pineau attends a technology demonstration at the META research laboratory in Paris on February 7, 2025.

Stephane De Sakutin | AFP | Getty Images

Pineau was one of Meta’s top AI researchers and led the company’s fundamental AI research unit, or FAIR, since 2023. There, she oversaw the company’s cutting-edge computer science-related studies, some of which are eventually incorporated into the company’s core apps. 

She joined the company in 2017 to lead Meta’s Montreal AI research lab. Pineau is also a computer science professor at McGill University, where she is a co-director of its reasoning and learning lab.

Some of the projects Pineau helped oversee include Meta’s open-source Llama family of AI models and other technologies like the PyTorch software for AI developers.

Pineau’s departure announcement comes a few weeks ahead of Meta’s LlamaCon AI conference on April 29. There, the company is expected to detail its latest version of Llama. Meta Chief Product Officer Chris Cox, to whom Pineau reported to, said in March that Llama 4 will help power AI agents, the latest craze in generative AI. The company is also expected to announce a standalone app for its Meta AI chatbot, CNBC reported in February

“We thank Joelle for her leadership of FAIR,” a Meta spokesperson said in a statement. “She’s been an important voice for Open Source and helped push breakthroughs to advance our products and the science behind them.” 

Pineau did not reveal her next role but said she “will be taking some time to observe and to reflect, before jumping into a new adventure.”

WATCH: Meta awaits antitrust fine from EU

Meta awaits antitrust fine from EU

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