I don't really meet anyone from the *chans. Then again, I don't really ask.

Sometimes I can identify someone by their words and recognition of *chan terms. But er, if a guy was caught using them, it would probably be awkward.

You can always just find some sort of internet-savvy shirt and see if a girl laughs at it. Naruto fans always crowd around my Gaara shirt; maybe you can get some internet girls to crowd around yours.