best social bookmarking site

My personal top ten is most likely very similar to the ones you are familiar with. I like to submit to twitter, pinterest, reddit, delicious, stumbleupon, diigo, jumptags, and a few others that are interchangeable. The great thing about social bookmarking sites is there are so many of them. We signed up to Bookmarking Beast http://www.bookmarkingbeast.com and now we get backlinks across the traditional bookmarking but also the thousands of pligg based sites which has given us a diverse link portfolio and increased our rankings in Google and Bing.