Facebook and wikimedia
Fragment of a discussion from Talk:Task force/Strategy
According to [1] we receive 102 thousand image requests daily from Facebook and 25 thousand html (page) requests, these are identifiable click-throughs, see [2]. (+ some developer requests)
According to [3] from Google we receive 120 million page requests and 6 million image requests daily. (ignore google requests from the crawler page quoted above for facebook, those google requests are for spidering our content)