There has been plenty of reports of people not having a Facebook account, then signing up and suddenly having ads regarding stuff they've seen on the internet before, showing that Facebook keeps tabs on people who aren't even on the network yet, just in case they decide to join (or if they find another way to advertise to them without them joining).
That is simple ad retargeting and has nothing to do with like buttons!
Many ad platforms offer this feature and it’s fairly simple todo from a technical stand point.
Really the technology that enables it is not even something Facebook built! It’s your freakin browser! If you don’t want to get retargeted, just start using a different one...vote with your browser folks!
I can’t believe I am saying this, but the html web browser is not the ultimate sophistication! There was a world before it and there will be a world after! And what propels this process is users voting with the choice of browser!
