[merreborn]

> I'd really like to know everything FB tracks on those like buttons, it's probably an obscene amount of personal data.

When you request a page like this guardian article, all they'd have access to would be:

  * The url you requested, along with time and IP            
  * Any facebook.com/facebook.net cookies you have stored      
  * Any other headers your browser sends       
  * Metadata about the page itself that the publisher publishes via "og:" tags

Said og: tags look like this: <meta property="og:title" content="Facebook ordered to stop collecting user data by Belgian court"/>

How does that compare with what you meant by "obscene amount of personal data"?

[simion314]

Knowing who you are and what pages you visited in last years it is a lot of data that they mine and tag you and sell it to the advertisers. I think they can do a good profile of you by knowing all the obscure links you visit and how much time you spend there.

The users should have a choice, "Do you want this site to share your data with Fb,Google ?" If you do not accept you can't use it, but it is your choice not to use the website, the users will get informed because now I am sure most of the people don't even know about the tracking.

[lmartel]

So at minimum they've got your identity and much of your browser history.

Seems reasonable to call that obscene.