Recd the following text:
Hi, I'm Judy:) got your number online and wanted to ask if you are interested in some additional jobs. I know of a company that provides home improvement at a reasonable cost. Text me back if you are interested. Sorry if this message bothered you, I will not send it again. (I am a contractor).
More spammers, and scammers.

Do not respond to unwanted texts or emails from questionable sources. Several mobile service providers will allow you to report unwanted spam texts by simply forwarding them to 7726 (or “spam”) to enable the providers to prevent future unwanted texts from the specific sender.

TIP:
Put 7726 in your contact list, so you can easily forward those unwanted texts!

Source:
http://www.fcc.gov/guides/spam-unwanted-text-messages-and-email

More info:
http://en.wikipedia.org/wiki/Mobile_phone_spam
http://blog.usa.gov/post/89152807112/protect-yourself-from-text-message-spam

However, in many cases, the text origin, as seen on your phone, is faked.  The internet domain does not exist, or the phone number may have been spoofed.