It depend on how you use facebook.
I don't do any games, poking and what not. Facebook is a tool for me to link up and communicate with friends that I can't get to see. Because of where I lived before, I have a lot of friends in different places- Hong Kong, London, Sydney.. I got in touch with a lot of high school friends that I haven't seen for 30 years. (I went to school in Hong Kong but left for England afterwards and now am in California). We shared photos and videos and ended up having some reunion events both in Hong Kong and San Francisco.
I got together with friends in the professional field as well. Over 20 years ago a lot of us worked on this little project "Who framed Roger Rabbit?"

in London. Afterwards people went back to different countries. Some achieved great things (directing feature films etc...). There was a 20 years' anniversary of the film not so long ago. And on Facebook we shared some of the old photos that we took in 1986-88. It would not have been that easy doing this through emails.
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*Notice the guy in the middle of the group photo in the front with the hands in his pocket? That's Bob Zemeckis who directed Forrest Gump later.
I only use Facebook to hook up to people I don't see often and can't understand how people can have facebook friends that they don't know( it happens!). I am also very careful about how I use facebook and have a very high privacy and security setting.
Like I said before, if you use it the way you want to, facebook is okay.
-Paul

