How do you use social networking sites?

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Do you use social networking sites, if so what for? Do you really find them useful or just interesting and better way to gossip "get information". I use to think twitter for instance as something worthless and couldn't imagine what a site based on the question what are you doing now? could possible be used for. Until I started using it and discovered it's addictiveness and now I'm hooked.How do you use Myspace, Facebook, Twitter, ETC. separately or in together. Right now I use them to keep track of favorite musicians,music, friends just learning and am now combining Mylots in this effort let me know what you do with these sites and maybe give me and others more ideas.