"Like" Buttons Track Your Every Move

This is worse than I thought.

...a person only needs to have logged into Facebook or Twitter once in the past month. The sites will continue to collect browsing data, even if the person closes their browser or turns off their computers, until that person explicitly logs out of their Facebook or Twitter accounts...

http://finance.yahoo.com/family-home/article/112769/like-button-follows-users-wsj

Damn!  I knew it was a bad idea to "Like" all those panda porn sites.

Haven't you noticed that when you go to some site, like the NYT or Slate or something, there is usually a sidebar that shows what your "friends' have liked recently even if you don;t have FB open. I mean, I didn't know how they did it, but they make it very obvious. If you think you have any privacy on the internet then your just deluding yourself.