Driving instructor added me on facebook?

Hey. Is it professional for a drivings instructor to add you on facebook? We are not even that "good" nor close, yet he sent me a friend request. My male friend, who is also one of his pupils, is his really great family friend, yet he never added him! Plus, he told me that my instructor has a thing for younger girls. What do you think about this?
Driving instructor added me on facebook?
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