Pixelfed Groups will be compatible with Kbin, Lemmy and Mastodon (when they release support)
The beta will be released later this week, keep an eye on this pull request 
https://github.com/pixelfed/pixelfed/pull/4603 #pixelfed #groups
GitHubGroups by dansup · Pull Request #4603 · pixelfed/pixelfed
@pixelfed Do you have more information about the specific AP standards you're using so we can get cracking on support?
www.w3.orgActivity Vocabulary