What does it mean if a guy runs after you and asks for your Snapchat while his group of friends wait behind him?

This happened to me at the mall today and I was so confused. The guy seemed to be in his teens and his friends also seemed to be teens too. Any advice? I'm new to this dating thing.

What does it mean if a guy runs after you and asks for your Snapchat while his group of friends wait behind him?
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