There are definitely some "cliques" or crews or whatever at Snoqualmie.  I generally ride with a pretty big group of kids, but there are some I never ride with (not intentionally, of course).  I think a lot of it (with us at least), is we're filming a bunch.  Everyone in our "crew" is trying to get shots, and we kinda stay to ourselves?  I love meeting new people and riding with them, though, and I think I've already done that a bunch this year.
If anyone from Snoqualmie wants to shred, let's do it!  I have a black jacket and purple pants with T-Halls.