Received this txt on my phone and it read: 415-589-9686 HaHa Kathy http://y.c.o/q9dH0gMo. I replied "who are you" and no response... So I am reporting it.
I figured all this out. Facebook recently got hacked. I am pretty sure you all have a Facebook. You all probably saw a mass messaging with all your friends in it. So if you put your phone number on Facebook, then this is how they got your phone number. I hope this helped :)