I think the site is a lot more user-to-user-centric than user-to-tribe-centric, if that makes sense. If you follow people, you get to see what they post (snap), as well as their comments. Activity of others normally drags me into threads which I probably would never be in otherwise. While the tribes exist (and are good in and of themselves), following others will give you a whole lot of interactivity as well.

So, check out the "Top Members" bar on your right, follow a couple of the top guys and hold on.

I think Snapzu in general follows the Golden Rule. Be nice, be friendly, post neat stuff. These fine folks will do the same.