They're probably not good for SEO, but can you recommend any good websites for real time traffic. Twitter is a good one but your tweets are pretty much limited to your followers. I like the idea of sharing stuff with random people. Oh wait, I forgot, popular forums are good for that as well!
Many Q&A site is good for generating traffic if you are able to make quality answer. Unfortunately, we can found there are too many spamming answer nowadays
I had messed around with Stumbleupon, it brings you traffic if you put the time in. Yahoo is pretty good too. Digg is not one I have tried but I have heard of people getting success. Any site that gets huge traffic where you can post a link to be seen can't hurt.