After releasing its Notifications API in beta two months ago, Facebook is now reporting the results of its test and has decided to introduce the following new rules for developers, effective November 9th: Developers will only be able to notify users that are actually using their apps (within the past 28 days), and apps that send a high volume of notifications must maintain a 17% click-to-impression ratio. In other words, no spamming ó something Facebook warned about when the product first launched.
On the positive side, this API brings unprecedented potential for apps and services to connect directly with users. Simultaneously, it also opens up the door for constant abuse, as the social giantís notification system is already flooded with internal activity. Facebook Puts Developer Limits On Notifications For Inactive Accounts [thenextweb.com]