What does it mean if an unknown guy sends a Facebook friend request?

There's this guy I only know of but I never met him! He sent me a friend request an I accepted it! So just to make conversation I asked him if we have met before an he said no but he's seen me at my job before! Does this mean he likes me an wants to get to kno me more and better?
What does it mean if an unknown guy sends a Facebook friend request?
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