Contacts + Facebook?

[SpykeZ]

So my cuzin was added to my contacts and somehow her facebook is linked to to her contact profile but theres no way for me to add someones facebook profile?

Then a friend messages me yesterday, didn't have her number in my contacts and couldn't for the life of me figure out how to add a person to my contacts through handcent sms then all a sudden she showed up in my contacts list as well with her facebook profile being in there.

I've got other friends in my contacts but I can't figure out how the facebook profiles are getting in there.