How to get rid of ads popup?
Those are Airpush ads, and the only way to truly get rid of them is to remove the app that is displaying them.

The other way to get rid of them, is to use the airpush opt out system to opt out of airpush ads, this however has been reported to not work by loads of users.

As such, the only way to truly get rid of them is to remove the app that is using airpush - uninstall apps you have recently installed, sequentially, until they are removed, or long press on the notification and select the App Info button that is displayed. This will take you directly to the app's settings page. (This is only available for Android 4.1 plus).