Twitter's exodus remains a trickle, albeit one punctuated by the occasional surge when Musk does something particularly odious and the costs of staying come into sharp relief, pushing users to depart. These days, most of these departures are for Bluesky, not Mastodon.
Bluesky, like Mastodon, was conceived of as a federated social service with easy portability between servers that would let users hop from one server to another.
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