So I kept getting tweets from ijustine saying she was playing blockles. I had to see what it was about and I have to say it it really fun. I just wasted a couple hours playing. Give it a go.
So I think I posted about flock a long time ago, but I have grown to like it again. It integrates a lot of social networking right into the browser without having to go to each of the sites. I would highly recommend you try it out.