The number of active Mastodon users — those who've logged in in the last 30 days — has fallen to 1.8 million from a high of 2.6 million. This reflects the fact that while there's a wave of new users after each Musk tantrum, the majority aren't sticking around. Even the 1.8M figure is inflated by new accounts, so I expect a further drop.

Still, the number of active users is over 4 times what it used to be before the Twitter takeover.

Source: https://api.joinmastodon.org/statistics (and Wayback machine).

Washington Post journalists on Mastodon:

@willoremus
@taylorlorenz
@teddyamen
@tonyromm
@tatumhunter
@Shira
@samueloakford
@rachellerman
@pbump
@perrybacon
@NaomiNix
@nitashatiku
@markseibel
@jeremybowers
@jeremybmerrill
@JosephMenn
@hamzashaban
@heatherkelly
@gbrockell
@geoffreyfowler
@Ddiamond
@databae
@cristianolima
@cqz
@bellwak
@andrewvandam
@alyssafowers
@aaronjschaffer

Please let me know who I'm missing! More to come.

Two excellent, in-depth guides to Mastodon, which should answer many of your questions, are here:

1. An Increasingly Less-Brief Guide to Mastodon by joyeusenoelle: https://github.com/joyeusenoelle/GuideToMastodon

2. Nikodemus' Guide to Mastodon: https://docs.google.com/document/d/1D9gfeKg_-hlsU66R-dLEvUeyMsqEfyIx2pnfUeX0t_E/edit#heading=h.j95atvlbfrn5

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