Why would a guy I work with send me social media friend requests when we barely talk in person?

To add…since I’ve accepted him he hasn’t said anything (slid into DMs), hasn’t liked any pictures, makes no comments. Hasn’t even deleted me. I’ve looked through his followers and I don’t see anyone else from work there…soooo what gives?
Why would a guy I work with send me social media friend requests when we barely talk in person?
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