Is there an easy way to see if something is an instance or community on the fediverse, or ‘just’ a forum on the web? For instance, would it always be mentioned in a sidebar? I know there are lists of instances, but i am hoping for something easier. I might be overlooking something glaringly obvious, but i thought i would ask.
Easiest way to know for sure is probably to search for it on fedidb.org. Instances don’t need to tell you they’re on the fediverse, but most of them have a link to the source code which will probably mention activitypub somewhere.