I quit Twitter and moved to Mastodon in October 2022 when Elon Musk took over. Many other academics also came to Mastodon, and I was very happy - see my pinned posts. But most of them later became inactive.
I stick around because I've decided that corporate-owned social media are dangerous - especially now, when authoritarians are spreading their reach. Turns out it's unrealistic to expect that most academics feel this way - yet. They may get the idea when it's too late.
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