WordPress and social networking sites

I am curious to know what social networking sites play nice with WordPress feeds. Facebook does a great job importing my blog content, and Tribe ain’t so shabby either. Myspace? Please. But anyway, what I’m wondering is if there are any other community-oriented sites where I can set up a personal profile and have my content imported to gain a bit more exposure wherever it may be. Ten social networking sites seem to spring up every week and I simply can’t keep track of them all! How are you making out?