This is exciting news for both users of Meebo and the social networks. The issue with chat on Facebook and MySpace is that you need to be logged into the site (unless you use a client like Digsby), as opposed to something like AIM, which you typically have running all day. Additionally, each of these services has its own buddy list with different people on it. By adding MySpace and Facebook, Meebo solves both of these problems.
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Strategically, by integrating Facebook and MySpace, Meebo is also adding a lot of value for its partners, such as Flixster, who use the service to power instant messaging for their users. Since the issues above are now solved, these partners, which also include Tagged, Piczo, and MyYearBook, can expect to see users spend more time on their sites too.