Hello Bobraz, ty for your answer. I've none of those and no plans to do so, but i understand that i'm kind of a relic of the past. I'm not against those kind of communities/services at all, but for me the balance isn't given regarding privacy, data ... .
I'm not wearing tinfoil, either, but the majority of people i know are way to loose (don't know a better word at the moment) careless might fit better with their data.
The drop in the ocean might be a fine analogy, but there will always be the final drop, that is the one to much, hard to predict which one it may be. Hope you get my point :)
Have a nice weekend