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Threads is officially starting to test ActivityPub integration
(www.theverge.com)
This is a most excellent place for technology news and articles.
They have orders of magnitude more users than all Mastodon instances combined already.
Part of that is only because any and all Instagram accounts are also considered Threads accounts. I have a feeling active users is probably in a similar ballpark
BS. There are 140 mil Threads accounts and over 2 bil Instagram accounts. You can create Threads account with Instagram and for a time they couldn't be decouple but that changed too.