at least intentional photoshopping seems to be ruled out then. if it would be done intentionally, then i guess all people would see the color difference and not just me.
i guess its either some bug somewhere in my system, or facebook did it while making the file smaller.
I saw the colour differences on the thread yet, when checking the original hosting of the images both appear identical and oddly enough they seem to both be the one I would expect to the the shopped version with higher saturation.