Just bought Fedilab on the Play Store, and i wish to look for an active community to see/share multimedia content.
Although the most active instance by far is pixelfed.social, that shouldn’t be relevant as you can interact with any pixelfed or mastodon account/posts no matter the server you join. So, you could join any pixelfed instance and follow the mastodon.art (most active multimedia instance) users, for example
As far as I know, no. But you can from mastodon, pleroma, or other similar microblogging oriented software
Are you looking for an instance or a community?