Here is the thing, privacy is an illusion today. Nothing is private except your thoughts. Facebook is no less private than Getbig when it comes to people being able to read your PM's and posts. Facebook just has more participants. But not to worry, most people will never look at your or my Facebook account unless you ask them to and maybe not even then.
getbig doesn't all of a sudden post my private messages as a thread here for everyone to see all of a sudden
getbig doesn't all of a sudden publish everyones private pictures or passwords
getbig doesnt automaticly go to your facebook front page and publish to everyone that you like to watch naked teen women and doesn't tell you about it
getbig doesn't
require you to like something kind of akward, publish it for everyone to see and THEN allow you to go look at it...
etc etc.
what goes in the net stayes in the net, but facebook is the same as I would be jerking off, then all of a sudden my appartments walls would go up and there would be a million head audience watching, thats' facebook. Facebook is meant to spy people legally, like actualy spying.
:EDIT:Not that you have any real privacy since the electronic chip era came tens of years ago, along with basic internet, but facebook is encouraging people to let go of the little privacy they have, that's why i don't support facebook anymore.
Skype is where it's at. Governments can't spy what people say in there thats why germany and russia for example want to make it illeagal, I also talk with my cellphone free of charged through skype, it's brilliant.