Advertising Age reports that Facebook will block apps that incorporate advertising that fail to comply with Facebook guidelines.  Two types of advertisements may no longer run on Facebook:

• Anything that sends "user data received from Facebook to ad networks," which limits the potential for behavioral targeting.
• Any ads that display user data in applications, "unless specifically approved by Facebook."

Facebook will still allow apps to incorporate "virtual goods, subscriptions, advertising, or whatever you choose."

To read the new Facebook guidelines, click here.