UPDATE: As of this morning there are now more than 7 million Mastodon users, most from the #TwitterMigration.

In fact, 100,000 new accounts have been created since last night.

Since last night's spike 8,000-12,000 new accounts are being created every hour.

Yesterday, I estimated that Mastodon would have 8 million users by the end of the week. That might happen a lot sooner if this trend continues.
By the way, if you're wondering why I'm posting from this account rather than my usual mastodon.social account, it's because mastodon.social is about to give up the ghost -- and as I told all you, it's best to have a back-up account and self-host if you're able.
If you want perspective on how bad Twitter's collapse is, the Guardian is urging users to back up and archive all their tweets. https://www.theguardian.com/technology/2022/nov/17/twitter-archive-tweets-company-shuts
Users urged to archive tweets amid rumors of Twitter implosion

People are wondering what parts of their online selves, loved ones and favorite celebrities to save in case the bird goes belly up

The Guardian
@atomicpoet can't get a backup anymore. maybe that involved staff?