Facebook hopes you and your pals (or family) will work together on self-explanatory collections like "Living Room Remodel", "Outfit Inspiration" and "Fitness Favorites." Tapping your network for everything from fashion tips to gift lists fits in with Facebook's social model, even if the feature is lifted wholesale from Pinterest.
Whether anyone remembers collections -- one of the countless features Facebook has churned out over the years -- is anyone's guess. After all, you can already bookmark posts on Instagram and (at last count) Pinterest was still going strong with 250 million monthly users.
Facebook has been trying to make collections a thing since 2014. Last year, it began rolling out the feature more widely. The boards are visible only to friends you choose to share them with, rather than on your profile and in the News Feed by default.
Update 12/4/18 11:31AM ET: This post has been updated to clarify Facebook collections started rolling out in 2014. We've also clarified that collections are only visible to friends you select by default, not on your profile or News Feed.