I noticed last night that photos uploaded from my Tour (4.7.1.40) using Facebook app v 1.6.0.21 look like total ****. It COULD be a scaling issue, I mean it IS taking a 3.2MP image and cutting it back to 604x453, approximately 4CIF, but similar tests with pictures taken from my Tour and scaled in Photoshop, and ****, even MS Paint, do not provide the same ****-poor results.
Hope it gets fixed in a FB app update.