dont know who this is

Got a text asking me to add them to im not happening

Me too, me! No way... tried to trick me by sounding like we had a history (text message). When I asked "Sorry, who are you?" the response was "haha if u want to know who this is you got to addd me on Y!ahoo"

Yes...I got the exact same text too!
I'm really curious as to how they got my number and knew my name since the only thing I have that kind of info on is FB and even that is set to private. O.o