That's interesting. For me, internet/facebook can make me excited or give a shift in my mood, but it's not responsible for my bipolar mood symptoms.

Likewise, communicating with other bipolar people face to face has affected my mood greatly in the past. I went to an in-person support group once and talked to a guy the whole time and our energies were just feeding off of each other and I felt hypomanic by the end. It wasn't true hypomania though, because once I went home it didn't last. I have never had such an experience with a non-bipolar person before though.

Friends, acquaintances, and people I don't even know have been able to tell in the past whether I'm manic or depressed by what I post on facebook, or in discussion forums.