http://www.telegraph.co.uk/technolog...based-ads.html
Very interesting
After paying Yahoo billions in patent infringements Google's been registering patents for any and everything they can think of.
With Facebook now getting sued by Yahoo who claims to own 20% of the ideas that Facebook is using this trend will only continue.
I used to take a look at this page http://www.sat24.com/ when i was doing some dating in UK and FR, because CTR was lower in sunny days