Do guys mean anything when they send girls a smiley face?

My boss is a guy and I notice that he likes to send me smiley faces. It is odd because often guys don't use smiley faces and he is in his early 30s- why do guys use smileys?

Updates
21 d
Him: Have a good night! :)
Me: u too :)
Do guys mean anything when they send girls a smiley face?
Post Opinion