If you mean that you want to meet with other Satanists for purpose of socializing or ritualizing, I think this goes the same way, it depends if they would like to meet you as well.

This doesn't happen randomly, at all.

Personally, I'd love to meet other Satanists, but I'm not going to meet any one from the internet just because he or she claims to be a Satanist.

I don't know if there is such a site, but you can try meetup.com.
You could organize your own meeting there.

Otherwise, I know that the Church of Satan sometimes organize Satanic events, but I suppose that these events are reserved for members only, and possibly attendance is on invitation only basis.