[ansh0l]

I'm curious - if I have a clean browser history(no Facebook login ever), and Facebook still tracks me, how does that information benefit Facebook?

Alternatively, how does it affect me?

[rockinghigh]

Their official stance is that these cookies are used for fraud detection: https://www.facebook.com/notes/alex-stamos/preserving-securi... In theory, Facebook could also sell these ghost profiles to web sites that have the Facebook like button or Facebook comments and want to show personalized ads.

[KanyeBest]

>Alternatively, how does it affect me?

They still record your IP address and link it to all the sites you visit that have a facebook script.