Cyber stalking? I don't think so. He doesn't know I'm doing it, and I am not making any contact with him. Research? Mmmm, yeah.
If I google someone, I don't think I'm invading his privacy. The ones who invade his privacy are the ones who post personal information on the web: the individuals themselves, their friends, their employers, etc..
Eh, it depends, certainly just doing a general sweep and finding out they're FB security isn't very tight and through that, sweeping their family's FB information, finding out that security isn't too tight either and finding out what you can that way, isn't too cyper stalker, but what they're talking about isn't general sweeping, it's activly getting in contact with family members and friends to find out about the person in question. It's a breach of basic trust. I got freaked out when my friend's uncle started messaging me on facebook because I hadn't realized that FB had changed some security features and now anyone with my name could message me.