From the little I get they are mainly thematic based and do not stop inter-server interraction.
I picked qoto as it is science oriented but many other are also.
The only two things worth noticing about servers is:
- finding people through browsing others "followers" I would only see the one on the same server as mine, hence limitation for finding people.
- server admin have strong power (clear password, moderation, etc.) thus I would suggest to avoid small shady servers
- one can change server if wanted.
Thing may change following this great migration ;)
@strigaud I'm not chipping in $8 a month to management of the bird site, but would be on board helping with costs with a bunch of like minded image analysis types. We're all pretty trustworthy