PSA to newcomers, crossposting
@ashwinvis not sure I agree it's "generally frowned upon". like, I've never seen any mention that the practice itself is bad. it becomes annoying if you are only replying on one site or the other when your posts are conversational in nature, or you're posting @ mentions for Twitter users exclusively, since not all clients can smoothly link to their Twitter profile.
PSA to newcomers, crossposting
@2ck If it is purely a stand alone tweet, crossposting mostly works, but as soon as there is interaction (reply, quote tweet, a handle), the post can often only be understood by moving to Twitter.
I only follow a few such account when they are very valuable and I never boost such posts.
Even a pure text post can be confusing. Recently came across someone talking about Mastodon to his Twitter folk, which made no sense in the Mastodon context.
PSA to newcomers, crossposting
@2ck
Well it varies from instance to instance, at least in scholar.social it was a server rule, see no. 7
https://scholar.social/about/more
Crossposting is certainly annoying and bothersome for people, like me, who have stopped using Twitter.