slscout.com is the latest SL-focused social networking site, and it's got all the right elements: embedded videos, forums, etc. Even better, they're holding a contest right now wherein users can post their favorite photos, have them rated by other users, and possibly win the First Prize of 25,000L!
Koinup.com is a social networking site akin to MySpace, but for virtual worlds such as SL, IMVU, and The Sims. There are a few such sites, but most of them are devoted to a particular platform, rather than the all-inclusive Koinup. One of the things this site has over its competitors is its graphical interface, which is fairly slick. 
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