Do guys mean anything if 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?

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1 y
Him: Have a good night! :)
Me: u too! :)
Do guys mean anything if they send girls a smiley face?
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