Some comments both here and on another site led me to wonder: What are the largest online communities? I'll limit myself to English-speaking communities for now.
Why is this useful? Well, it shows who's doing what online, and people on the internet are probably the best people to talk to if you want to leverage "netroots". A lot of political discussion also goes on in all these forums, whether overtly political or not, and a lot of people form their opinions largely based on some of them.
And, it's also bizarrely surprising, at least to me: I'll bet you didn't realize there were forums you'd never heard of with over 1 million registered users...
I'll list the ones I know of; please add more if you know of any others!
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