Facebook sidebar prompt: How well do you know your friend?

Facebook is constantly adjusting its post-sorting News Feed algorithm, occasionally polling users about the content they see. Earlier, Inside Facebook learned about a prompt that Facebook had in News Feed when a user hid a post. Now, an Inside Facebook reader reported seeing the above prompt in the sidebar about one of their friends.

Facebook’s goal for News Feed is to deliver the most relevant content, meaning users will see posts more often from their closest friends and pages with which they engage.