Since Facebook is a social networking site, it's not for quality photo distribution anyway. Sharing photos there is mainly for fun. That said, I don't have a lot of a problem with colour fade or anything like that on photos I've posted there, but that could be because I tweak my Facebook photos size-wise, sharpness and all, in Photoshop and save them for web apps, so that they'll load nice and fast for viewers. I don't just upload some huge file to have them chop out whatever they chop out.
If someone needs the huge original file for some reason, I can send it to them directly. They don't need to get it off of Facebook.