I think we all share a few common types of privacy that we don't want anyone else to be staring at with their creeping eyes:
Nudes
lovets
Personal info about loved ones
Download history
Etc.
Personally, the photo/video/audio privacy invasion is what bothers me most. There are conversations I have with my girlfriend that are kept confidential between me and her. As it is, I'm so protective of her that any other person that sounds like they might hit on her, I begin preparing ways to defend her from any potential creepers.
She lives about two and a half hours from me, so the fact that I can't communicate with her in real life (except when she comes to visit or when I visit her) is very difficult because I have to constantly think about what and what not to say, what and what not to do over Skype, etc, because I know that even if they aren't spying on me in particular, they're gathering information and have the ability to view it.
I don't want those motherforgeters seeing parts of my girlfriend that are to be seen strictly by me and only by me. This is an example that should be relevant to most people with relationships online/long distance. Personally, I believe that anyone who is okay with the current situation we're in right now has some serious hatred for liberty.
I'd rather die as a free man than one living under tyrannical rule.