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Threads already has over 95 million posts, 30 million signups
(www.theverge.com)
This is a most excellent place for technology news and articles.
That is literally how you sign up to use Threads, so I'm not sure this is a meaningful distinction.
The low barrier to entry was a very clever idea on their part.
It's very much a distinction. It's deceitful to claim there's "millions of users who signed up/activated" It's implying or coyly trying to say these are new accounts, especially to people who are on the outside and don't know. Better to just say, "Millions went back to Instagram to activate their Threads account."