If you've ever been weirded out by how you can be messaging a friend about going on holiday one moment and Facebook will advertise plane tickets to Spain the next - or discomfited by Facebook ads in general - then read on.
It probably won't surprise you to learn that Facebook keeps tabs on your activity to find out what you're interested in and likely to spend money on.
But do you know how to find out what Facebook thinks you like?
It's actually pretty simple. From your feed, click through in this order: