@orphean Sorry I was reading in a context-free listing. I guess @tuxxus Just does a web search for "GNU social" or "StatusNet" to find instances. It's pretty easy to scutter between FOAF profiles to find new instances, but of course the ones that are dead since 6 years back are unlikely to show up then.
@chimo has written this: https://code.chromic.org/chimo/graph-the-feds/ "This script crawls FOAF files from GNU social profiles and attempts to graph the connections between instances and users."