[randycupertino]

Yikes- wow, even from my computer browser- not even from my cell phone? If I have facebook password autosaved, log in, check facebook, and close the window without logging out, is it still tracking me? Damn. I did NOT realize this.

[r053bud]

I also recommend installing EFF's Privacy Badger extension. It shows you everything that is tracking you across the interwebs.

[DCoder]

Look at any other website - is there a FB Like button saying "25 of your friends liked this"? Congratulations, FB now knows you visit that site.