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Bluesky is now open for anyone to join | TechCrunch
(techcrunch.com)
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Whoa man, I totally forgot about that functionality. I looked it up to see if it was still supported but seems that they retired it in April 2020, with the exception of a few countries. Kind of crazy they kept it going that long given how obviously unsecure SMS is (which is the main reason Twitter gave at the time for why they were retiring it).