The celebrity leaked nude stuff had a lot of DMCA flying around, pretty sure they even nuked a couple subreddits to comply with some of it

Yes, but those were subreddits that popped up and were dedicated to sharing those pictures. I doubt any genuine community was affected.

Oh I don't know any real details about it, or what "community" was affected, that's just what came to mind when they mentioned DMCA take-downs in the post. I don't think there was a ton of other content that got enough attention to warrant takedown notices

I imagine a lot of them were for image thumbnails since reddit actually hosts those.

And then the CEO wrote a hypocritical blog post about it. Pretty rich.

This is limited to data Reddit HQ legal has dealt with. The subs in question may not even be aware. The admins often play their cards close.

This is correct - the top question in reddit's comments to this post asks this [1], and the admins answer that the mods could report these takedown requests as reddit Inc. does not collect them.

[1] http://www.reddit.com/r/blog/comments/2u3sqp/reddits_first_t...

I'm willing to bet video-game emulation communities are in that list.

some /r/hacking subscribers had some odd PMs. Maybe some of them?

Spacedicks had all of them