Sony's picture management software, Picture Motion Browser, includes an Upload
to Facebook/flikr/Picasa option, but no 'on camera' feature as I can see.
Similarly Panansonic's PHOTOfunSTUDIO software can Upload
direct to Facebook. Again, no on camera feature.
The cameras with built in "share" features all seem to still require the camera to be connected to a computer (for some reason I had assumed it was done via wifi). So as well as the Kodak EasyShare C195, M531, Z915 etc have a look at the Fujifilm FinePix Z70.