Twitter cofounder Jack Dorsey, who is also CEO of Square, will be interim CEO when Costolo steps down on July 1. When Twitter finds a permanent replacement, he or she will face several big challenges.

Replacing Twitter, with its robust network of journalists, politicians and entertainers and sizable audience of users obsessed with real-time news, may be a challenge.

As Elon Musk critics flee from Twitter, Mastodon seems to be the most common replacement. In the last month, the number of monthly active users on Mastodon has rocketed more than threefold, from ...

The other challenge for Mastodon’s ability to scale is that it has very scarce resources compared to Twitter. Rather than relying on investors, Mastodon survives on donations, crowdfunding ...

The app went live Wednesday in Apple and Google Android app stores in more than 100 countries. Instagram users will be able to keep their user names on the new app.

The app went live Wednesday in Apple and Google Android app stores in more than 100 countries. Instagram users will be able to keep their user names on the new app.

Meet Threads, the new Twitter replacement from Instagram The app went live Wednesday in Apple and Google Android app stores in more than 100 countries. Instagram users will be able to keep their ...