I run an awesome free App called Little Snitch ... it basically prevents my MBP from accepting suspect connections to the Internet. (works like a reverse firewall) I was amazed at how many apps want to connect to the internet.
one simple example is ... I have a "Slots" game from Hoyle ... when I launched it ... It would have connected my computer to their server for some reason.
I clicked deny forever ... Google is always trying to get my computer to connect to them ... I always deny them.
I have zero respect for Google, Facebook or Twitter.