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These tools search Twitter's API to find info that looks like a Mastodon username in people's names/profiles. You can import the resulting CSV into your Mastodon account. To manually follow, you need to copy and paste someone's "username@mastodonserver.name" into search or....
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... you can also use this iOS shortcut to follow people on Mastodon without having to copy and paste! mastodon.design/@justin/109326 (Scroll down for installation instructions in the replies as well as a different iOS shortcut to view someone's following/followers on Mastodon)
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