With all the new announcements at the Facebook F8 conference, Facebook is going to be showing up on a lot more web sites. 

Here's a quick way to see what Facebook is sharing about you:

http://graph.facebook.com/your-facebook-username

Just replace your-facebook-username with your username on Facebook and you'll see exactly what they are sharing about you. 

Here's what comes back for my ID:

You can change this in your Privacy Settings in your Facebook Profile.

See this article for some tips on setting privacy: 5 Easy Steps to Stay Safe and Private on Facebook

See also: Time to audit your Facebook privacy settings. Here's how.