Okay, I know I am probably out of my place when I say this, but I've been seeing it happening everywhere lately.
'Your welcome' is incorrect. The correct way is 'You're
is the shorter way of saying You are
. You are basically saying 'You are welcome' to someone who has thanked you.
'Your welcome' is like saying the welcome belongs to that person. 'Your' is possessive.
Oi, I'm too tired for this. I just needed to vent, guys.