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1.
Someone preoccupied with going from social site to blog to social site as their sole or primary means of human interaction and validation.

The cyber version of a barfly or social butterfly. Also known as cyber butterfly or social media butterfly.
A day in the life a cyberfly:

@tracykitty123: Today was awesome! 22 new friends - all on Facebook. I had a great Skype with my colleagues in Germany, Britain and China. I completed my online course in SEO. And, the topper, I was introduced to Deepak Chopra via LinkedIn today! Now I'm going to decompress by getting naughty in a chat room on Livelinks! Can't wait until I get to do it all again tomorrow!
by Tenacious Faulker March 09, 2013