Threads reached 500 million monthly active users in June, according to Meta — yet the platform still has not become what Twitter was, and no rival has either.

That is the central finding of an assessment by Deborah Bowen, assistant professor of instruction and integrated public relations and advertising at the University of South Florida, nearly four years after Elon Musk bought Twitter in 2022. Threads brought Meta's reach. Bluesky promised a more open network. Mastodon offered decentralization. Users scattered. But none has recreated Twitter's role as a shared cultural stage.

"Twitter was really the platform when you wanted to go have some kind of interaction with people who are doing something bigger than themselves," Bowen said.

She pointed to the Super Bowl blackout in 2013, when Oreo jumped into the live conversation with its "Dunk in the Dark" post, as the kind of collective second-screen moment Twitter made possible. "We are so spaced out now," Bowen said. "I'm not sure that kind of togetherness is going to happen again."

Her advice for brands assessing social media in 2026: stop looking for the next Twitter. It probably doesn't exist. The audience that once gathered in one place now spreads across countless smaller communities.

Threads won scale, not connection

On raw audience, Threads is the clear winner. Meta said the platform hit 500 million monthly active users in June and is leaning harder into communities, including dedicated spaces around books, sports, parenting and music. Similarweb data reported by TechCrunch estimated 147 million daily active mobile users in July, up 21.3% from a year earlier.

Bowen initially expected Meta to win. "I thought if anybody could possibly go up against that microblogging juggernaut, it would have to be Mark Zuckerberg," she said.

But the numbers did not translate into the experience she wanted. "I found it hard to chat with people on Threads," she said. "I just didn't find it to be satisfying." The distinction matters for communicators: a large audience doesn't equate to a strong community.

Bluesky lost momentum

Bluesky comes closest to the old Twitter tone, Bowen said, but with limits. "The closest I'm seeing to that tone now is on Bluesky," she said. "But the kind of biting, sarcastic, edgy, not edge lord, but edgy stuff that you could get away with on Twitter, it's not on Bluesky."

The usage data reflects that gap. Similarweb estimated Bluesky had 10.4 million monthly active mobile users worldwide in June, down 27.2% year over year. Daily mobile users dropped 25.6% in July to about 3 million, even as the platform approached 46 million registered users.

"I'm seeing the same people who were on Twitter, the same newsmakers and kingmakers and so on, but it's just different," Bowen said. Migration spikes, she added, are not the same as durable behavior.

Mastodon's structural hurdle

Mastodon remains structurally the most different, a decentralized network spread across independently operated servers. It has stayed far smaller than Threads, X or Bluesky, and publishes its own network statistics based on its crawl of accessible servers.

When Bowen tried it, her first reaction was, "I don't understand that." A platform can offer greater control, she said, but mainstream users still need to understand why they should join and how to use it.

X survives, differently

X remains far larger than Bluesky or Mastodon. Similarweb data showed 123.7 million daily active mobile users in July, down 7% year over year, and a worldwide monthly active mobile audience of about 302 million in June. Web visits increased 5.3% year over year in July to 4.7 billion. Declaring X dead is not accurate, Bowen noted — but its audience is different.

The real winners look nothing like Twitter

The platforms gaining ground, Bowen said, are Instagram and TikTok. Both are visual, algorithm-driven and built around endless content discovery rather than text-heavy public conversation. "One thing I loved about Twitter is that it was the reader's platform," Bowen said. "I could go on and just read. Now we have pictures, videos, captions, et cetera in one post."

For brands, platform choice now depends on audience behavior: where a following has formed an actual habit, what it does there and whether the brand has a natural role in that behavior. "If I'm a brand, I'm going to figure out where my people are," Bowen said.

The uncertainty itself is the story. "I think part of the issue is that we haven't gotten our footing on these platforms yet," Bowen said. "We don't know what they are supposed to be. And we don't know what we don't know."