Link opens an empty white page for me :) May be Threads is down already from this growth :)
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This may be because of a technical error that we're working to get fixed. Try reloading this page.I installed Threads on my iPad but don't have Instagram installed there (Instagram is on my phone). Threads needs to be on the same device as Instagram. I was expecting to be able to log in with my Instagram credentials, not log in with the Instagram app.