How to remove Facebook Virus - Time Checker?

[raj s]

So I had clicked something on facebook and now there are posts on my wall automatically stating how much time I have spent on Facebook. These are random numbers.
How do I get rid of this? By just changing the password?

Thanks!
EDIT_1 : Neither of them worked for me. However, I did come to know that the "app" uses JavaScript to get the password when we first click it. So, for now, I have changed the password and I am hoping that will help stop it.