There's a million Social Networking websites nowadays. Which ones do you like, and which ones are lame?

We use: Twitter, Facebook, YouTube, Vimeo & Flickr.

Facebook seems to be the gold-standard in social networking. You can easily share everything and keep up w/ your friends. However, Twitter is my favorite b/c it's the most fun! It gives you a quick view of what everyone is doing and you can quickly share interesting links. Something about the constant updates gives Twitter a velocity & energy that is really fun. Also, recently interested in Tumblr, b/c it lets you easily share photos & thots. And there's an app for your phone that lets you easily update it.

What social media sites do you use/like & why?

(Does anyone use peoplebrowsr or other tools to aggregate & manage all this social media nonsense?)