Twitter Co-Founder @biz just endorsed Mastodon!
In a Guardian interview, he said:
“I don’t know that Twitter as a company is going to succeed for ever but the idea of Twitter I think will be around [indicating Mastodon].
"It would only matter that Twitter the idea continued. And that’s happened. That seems to be happening already. Mastodon seems to be winning the open-source, decentralised version of Twitter. People seem to be going there."
It's also worth mentioning that another Twitter Co-Founder, @ev, is also present on the Fediverse.
A few days, he indicated to me that he's been here for awhile -- and has multiple accounts 👀