I run a private mastodon instance just for myself, and I’ve been thinking about the feasibility of importing all my old tweets from twitter.com into my instance, so that I have a consolidated history. I know there are services which crosspost new posts in both directions, but I haven’t found anything which imports an archive.
Before I start exploring how to actually do this, I thought it might be sensible to get a sanity check. Certainly there’d need to be some rewriting of twitter handles and so on, but are there any ActivityPub-specific pitfalls I should be aware of? Would doing this spam every other server that federates with mine with an unacceptable number of updates?