Browser Information, Demographic Data, Interaction Data , Page Views , IP Address
In other words
Well, since this is one of the largest information gathering companies out there and with access to our Facebook profiles (d’uh), the above list just shows part of the information gathered.
With all that’s stored they can build a near complete profile of a person, with friends, family, interests and apolitical views (which they do for all who’s targeted by their cookies – Facebook user or not).
…which they also can sell to third parties.