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This is the best metrics based comparison I've seen so far looking at Facebook, Twitter, and Google+ from a professional community perspective. I enjoy the author's statement, "For example for friends I use Facebook, for interests I use Google+, for following what new in blog posts I use Twitter and when I don’t want to be social in any way I use LinkedIn. "
Social media and Google Analytics - who's interested in botany?
Alex Joseph's profile photoDennis D. McDonald's profile photo
Interesting analysis -have noticed that the same people behave very differently on different networks.
+Alex Joseph Very true. Different roles demand different communities and different communication behaviors. It's the same in large companies where social media are adopted to support corporate work -- different groups end up using the services differently. 
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