Facebook has several help posts involving privacy and app settings. The easiest way we’ve found is shown below, with some helpful links after that.

1. View your notifications. When you see an annoying invite you wish to block, click ‘see all notifications’ at the bottom of the list.

2. When you click ‘see all notifications’ you should get a page that looks something like this. Find the invite on the page. When you move the mouse pointer over the app notice, a small ‘x’ will appear to the right.

3. Click the ‘x’. When you do, it will say ‘turn off’. Click ‘turn off’, and a notice will appear telling you you’ve successfully blocked the game or app. That’s it!

There are other ways to do this through privacy settings and blocking all notices from a friend. Here are a couple of links that may also be helpful:

http://www.facebook.com/help/?faq=202866049749634

http://www.facebook.com/help/?faq=121070141307903