I just got a msg saying the same thing. And because I live in Phoenix and that is my area code and I have friend named Sarah I replied. I wonder if now all my info is out there.

I would guess most of u had Craigslist posts with your phone number listed....Correct? That is generally how these marketing companies obtain our info (both phone #'s and email addresses) & unfortunately there isn't a whole lot u can do except ignore it, delete the message and just move on! I also received this exact same text this am.. from 480-717-0565 (but have also gotten others in the past very similar) They want u to go to their adult dating and socialsex site!!  
Note....BEWARE!!
*** DO NOT ENTER that domain ... mine was listed as  MEETHAPPY.COM & has known virus & malicious activity and may cause harm to your computer of phone...by accessing your personal info and passwords!  Beware....
Caller Domain: http://www.socialsex.com/dating/freesexandadultfriends

i have also received this message

Txt from "Sarah" , who's probably a punk boy or fat hairy pervert, telling me they posted pics on meethappy.com. From 480-707-9490.

If you find Sarah, kick him in the balls for me too!!!

Other people got the same junk text, but from the number 480-696-0524. Forward it to AT&T's 7726 (SPAM) and send them the originating number.