Stupid question (maybe), but is username searching across instances kinda... weird? Like the results are deeply hit-or-miss? (just got on a second instance and am trying to re-build my following list... a bit)
@nothingfuture you can import and export your followers in other instances.

@nothingfuture
The only sure way to find someone is having his/her/their full Mastodon address

@ jansegers @ mastodon.network

@jansegers

otherwise only the already connected people to your instance with that username show up

toot ! :elephant:

@nothingfuture If by hit-or-miss you mean people that appeared on the first instance aren't returned by the search on the second instance, it's possible that no one on the second instance follows that user (and therefore that user has not yet been added to that instance's federated timeline).
@nothingfuture search on an instance only knows about users who are in the "known federation" of that instance (followed by >0 users of that instance)