I will vouch for the fact that Snapzu quickly becomes much easier to use, and once you know how to take advantage of the depth of its functionality, it's hard to go back to other sites!

Two great ways to increase your participation are to go find tribes you're interested in and talk - a lot of tribes are smaller and so welcoming of participation. The second way is to sort your front page by "Newest" instead of "Trending" and participate in threads as they pop up. The people posting those threads will appreciate the feedback (since no one likes their snaps or posts to go ignored) and you'll quickly learn about all sorts of interesting parts of Snapzu.