[jrochkind1]

Cookies? From marketting networks?

It's amazing how much the marketting networks can figure out about you, and keep track of you with a cookie.

[corwinstephen]

I'm sure this is the case. They probably keep track of all the accounts that have been logged into from your computer via a cookie, and then suggest friends based on those accounts. Creepy, but understandable.

[stinos]

yup seems more likely (to me at least) than matching on an ip address