Clever new tailored advertising

Well bugger me. The other day I was looking for bike parts on Wiggle.co.uk. I got there, not through a link, but by just loading it up fresh in a new window. Then only a couple of days when I was in Facebook, I noticed that there was an ad for Wiggle and it was tailored to me. It was advertising all the things I was looking for on the ad.
I presume it must be that they are now sharing cookies. Very clever indeed. Especially considering the two sites are not obviously linked.
Frankly, it's about time Facebook stared doing stuff like this. It's got all that info and has always been so useless at targeting people's interests, etc.

Richard
www.nicework.webeden.co.uk