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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.
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.