Dividing the Web Images Pie - Who has the largest slice?

Photo Web Sites Market Share

Apparently things are not really going well over at Flickr.

If Photobucket is around 2.5 billion images currently then the best guess of on-line imagery would suggest more than six billion images on-line - up from essentially zero eight years ago? Photobucket looks to be the dominate service by a factor of severn or eith over the next best Yahoo Photos. No wonder Microsoft is sniffing around buying Yahoo?