To facilitate the #twittermigration I put online the #mastodonR package. It has a #migratweet function to get a .csv file with the Mastodon accounts of one's followers and/or followings on #Twitter who put it in the "name" field. The file can be easily uploaded to Mastodon.

I may add new functions later: "Right now it's only a notion, but I think I can get the money to make it into a concept, and later turn it into an idea" (W. Allen)
https://github.com/nicolarighetti/mastodonR