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Threads gained 10 million new users in seven hours
(www.engadget.com)
This is a most excellent place for technology news and articles.
Is it something they read or something they've done? Perhaps they had to make their own Threads account.
I wouldn't be surprised if many accounts were auto-enrolled, but it may be based on activity or just a random selection to boost numbers without the massive leap of all accounts being transferred at once.