Maybe this is of interest for you: https://media.ccc.de/v/35c3-9941-how_facebook_tracks_you_on_android https://media.ccc.de/v/35c3-9941-how_facebook_tracks_you_

Maybe this is of interest for you: https://media.ccc.de/v/35c3-9941-how_facebook_tracks_you_on_android https://media.ccc.de/v/35c3-9941-how_facebook_tracks_you_on_... Seems to me, this is pretty much exactly how this works.