I'm just going to keep adding to this #MastodonSocial#TwitterMigration thread. Other viable options will likely pop up after twitter disintigrates, but in the meantime:
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Okay, so check out pruvisto.org/debirdify/ Here's what they say: "This website allows you to search the people you follow on Twitter for possible #Mastodon/#Fediverse accounts." People going to Masto say it works great and does the major work I've been mulling over ✌️🏼
I just tried @debirdify - It searched who I'm following, identified who has a #MastodonSocial account, provides a chart showing where they are, and gives a list of accounts by instance. You'd need to run it more than once w/ppl moving as they are :o) It'll also search followers.
If you'd like to dip your toe into #MastodonSocial without physically posting in both places, you can use this cross-posting tool! You can authorize twitter access from the site: crossposter.masto.donte.com.br/user
Although now that I've been on the #mastodon side I'll say that this can result in your feed seeming pretty spammy and I stopped using it. I'd love it if there were more discrete settings! Nonetheless it works as advertised :o) #TwitterMigration#Crossposting