Question [Q] update via not working

GUys, after updating to latest firmware (15.1.c.2.8) in xperia m (single sim) if i post pics through fb app with "xperia in facebook" the 'via sony xperia smartphone' tag at the bottom is not coming. It used to come on the previous firmware. Can any1 confirm if this is the issue or its just my side?

How to i make it happen??