Facebook launched a beta version of a new notifications API, a tool for developers that lets all Facebook apps send notifications to users. This mean that your Facebook notification alerts would increase , especially if you have signed up for lots of apps.
“In recent tests, people who received high-quality app notifications were five to ten times more likely to click through than they were for requests. Alternatively, people who received low-quality app notifications were more likely to turn off notifications from the app.
We encourage you to test and monitor how your notifications are performing. The new Notifications dashboard in Insights shows feedback on notifications sent via this API, including information on turn-off rates. Apps with with exceedingly high turn off rates for notifications may be classified as spam and disabled. You should watch Insights closely to make sure your notifications are well received by users and not in danger of being shut-off.” said Facebook in a blog post.