Received this message:
"Download + add me http://i.glide.me/join" at 10:21am CST, Mon, Feb 24, 2014. Unsure who sent to me, I'm not replying, using the link (especially since I only have a basic mobile plan), or going to the website. I'm on the DNC list and am careful not to give the number to anyone.

It is a video messaging app for smart phones.
The company has "supposedly" taken measure to prevent "auto-spam-invite" from their users.
If you do not recognize the number the text was sent from, then go ahead and forward the text to SPAM (7726) this will flag your cell carrier that is it spam and they can take action.
https://www.fcc.gov/guides/spam-unwanted-text-messages-and-email
Then block the number via your cell carriers filters.
Do not respond to, call, or visit any number of link provided in the text, as this will only validate to the spammer that your number is legit.