I don't really use Facebook very much anymore. Why? It's kind of become a little unwieldly- with all the advertisements, the applications, all these new features, etc. And as people's friends lists get longer, we just don't have the time to keep track of everyone. I don't need to see the news feed about everybody I know and everything they did. The only real useful application is the photo-sharing, and keeping a "wall". I think Facebook needs to simplify and to focus just on photos and its core business of managing friends list.. anything additional is going to eventually backfire.
Google, on the other hand, seems to know how to do it well. Gmail is a wonderful invention that combines instant messaging and easy-to-use email in the same window. Their new browser- Google Chrome- is fantastic. I still use Google Finance, GoogleApps, iGoogle, Google Earth.. all these things are innovative, very useful, and fun to use..