Actually, I'm not too sure. As far as I've seen, there's not much activity in most of the groups, the activity took a hit when the part at the bottom was removed, and didn't fully recover when it came back. I know there's some groups with activity, but if this was before they removed it, then I'd surely list them as a main group. Now, I'd say they're more a niche. A niche of what, I can't really say.