Message said "hey lexi some girl is talking about you" and the link takes you to an app on the App Store. I've seen a couple more messages floating around that came from a different number but was the same concept.

For text messages: forwarding any text message spam you get to the short code  “7726,” which spells “spam” on most phones, to alert your network operator to the abuse. ATT won't accept 7726 But they will accept BLOCK and return a message that the web site is blocked. forward the texts to 7726 or BLOCK, depending on your phone carrier.
http://www.att.com/esupport/article.jsp?sid=KB115812

Texted me the same message at 4:50am

Same call as san francisco

Message said "hey Kevin some girl is talking about you