It's coming December 14th.

Threads has been slowly launching features: it now has hashtags (and even emoji hashtags), a web app, polls, an edit button, the ability to view a 'for you' feed and most recent threads, and they're testing "trending hashtags" in Australia. Threads is reportedly struggling with some stats, indicating it's down 80% from its launch peak. 

Threads almost wasn't called Threads. "Epigram" was a popular name internally at Meta. The project's codename was "Textagram". 

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