Are you connected using 3G? They'll be able to infer from that which areas you spend most of your time in, because your provider sells that information on to them. Oh yes. (Possibly.)
All of these services would be chargeable without adverts. Just saying...
I want to install a component on all computers so that whenever someone writes "just saying" it opens a hatch and punches them in the privates.
And if they also say anything equivalent to "you're not allowed to complain because it's free" or "the adverts are the price you pay" or similar then it also slaps them round the face.
Are you this angry in real life?
I don't entirely subscribe to that notion, and free things can certainly be shit but the adverts are the price you pay and honestly, if you dislike it so much just stop using it.
I don't particularly enjoy the Facebook experience, but it's free and mostly works.