Well, the authors of malicious software have a realized that a lot of people are interested in changing the color of the timeline and that it's an easy way to steal personal data. Indeed by installing (malicious) applicatio, you authorize the collection of Facebook data!
Overview of a malicious application:
To remove this false application, you simply go to your Application Center
Then click on "Your Applications"
Select the malicious application (which exists under several names, however it seems that the same logo is being used):
Simply place your cursor over the small cross that appears and click "Delete."