Adult's view of 3 social sites

San Jose Mercury News columnist Dean Takahashi wondered "which social network [was] worth joining" among three biggies: MySpace, Facebook, and LinkedIn. The three "all make it easier for you to express yourself and meet people with shared interests, but each focuses on a different area." You'll want to read the article for details on each, but he makes a good point that no single social site can do all things for all people - each has its strengths and weaknesses, which of course are different for each user. Meanwhile, CNBC reporter Julia Boorstin offers a look at some newer niche social-networking sites.