When special Facebook applications are installed they may email friends and contacts excessively. These links provide helpful controls:
QUOTE: That’s why Business Insider published a valuable blog post this week telling readers how they can stop their Facebook apps from spamming their friends. First, open your Facebook page and click on the “Settings” button in the upper right-hand corner of the browser window. Next, click on the Apps tab underneath “General Account Settings.” From there, you can control all facets of your apps, including who can see them, what they can do, and whether or not you want to keep them at all. You can also click the “X” button next to the option for apps to “Post on your behalf.” This will effectively prevent your apps from spamming your friend list.