Seriously, if someone wants to know who posted it, they can hover over it with their mouse on a computer, and if they're on a phone, they can just click on it and see. It makes you look like an egotistical idiot.
My suggestion: quit.
Edit: This thread is not to single anyone out. It is not in response to DrProof, either. I have noticed an increase in people doing this, though... and to be quite honest, it just makes you look conceited beyond belief.