It is an app wanting you to download the app, I had it a few days ago. Open the notification bar and click the link, it will open app world and take you to the app, then you can just close out and the notification should be gone. Also, go into the messages folder and delete the message after as well. It is from a developer that you have probably installed one of their other apps.
Has anyone figured out what app does this? I wanted to get rid of it
Once you go into BB world you'll see which one it is. A pesky marketing trick used by some developers. If you want to keep the app I suggest writing them and ask to stop sending to you.