Facebook is testing a new “Notify a few friends about this post” button
Facebook is running a “small test” of a feature that would allow users to send certain friends notifications about posts they might be interested in.
You can send notifications to 10 friends at a time, by clicking “Notify a few friends about this post” button, and your friends receive those notifications.
A Facebook spokesperson confirmed the test saying that when you make a post that is particularly interesting to certain friends, you want to make sure they see it. Instead of tagging friends in the post or the comments section, we’re testing a more discreet option to alert them of your post by sending them a notification.