fake accounts in fb!!

I reckon they don't know you. Just like people trying to scam you. Maybe they have tried to ask other people!? Does it say where they live? No offence to anyone but if it said, for example, "lives in Saudi Arabia" then obviously it would be a scam. If not the maybe they are trying to harass you. I would delete, block & report them straight away. There is always that rule "don't add anyone you don't know". 

Oh and I reckon just because they have no friends yet and are freshly made doesn't mean they purposely made that to harass you. It would be because they are looking to scam people into giving them money or sexual stuff. That's just my opinion though.