Heh - I had an experience similar to Biciclista. Part of my job is issuing (balanced, impartial, well thought-out...) permits for hydropower plants, and we can get stuck in the crossfire between the hydropower companies and local environmental groups. During the hearing process one woman sent me an impassioned plea by email to "save" her local river. But next thing I knew she wanted to friend me on Facebook, to a group dedicated to saving this river...

I had to point out that I could hardly be expected to do my job and be impartial on this case if I were on a list dedicated to the one side's point of view. And that maybe she should look closer at her email list before issuing blanket invitations like that.

Facebook brings up strange situations. And it's notoriously hard to judge what people mean from just a stray, written comment.