Yesterday I got a message from a facebook?

[DD]

user that said "hi hi what are u doing" and I don't know who she is and how he or she was able to message me. I don't think that my contacts even know that person as well. I want to know how can that person was able to message me if i don't even have them as friends and how can I stop that person from messaging me?

[secret life]

You can block them or you can go to settings and not let anyone msg you who is not in your friend list

[Olufuwa Deborah]

nybody can message u without being ur friend...the tab is right there on the screen...u can even poke the person without being friends...