At the turn of the year, Zuckerberg announced that Facebook would be focusing their efforts on ensuring that the time users spend on their products is time well spent.
Instagram and Facebook are apparently prototyping Do Not Disturb features that let users stop notifications for a given time period. They are also rolling out a 'you're all caught up' warning in their feeds to prevent excess scrolling (or rather non-meaningful engagement).
I think that Zuckerberg and Co turning their attention to the Time Well Spent philosophy is a move to solve three big problems that have cropped up for them in recent times:
1. The digital attention crisis that Facebook and its products have helped foster.
2. The increased reticence of their userbase when it comes to original broadcast sharing. Or rather, the increasingly passive behaviour their users are enacting on their platforms.
3. The negative impacts that Facebook and its products have on users' wellbeing.
Conceptually, it's intriguing to see how applications like Facebook and Instagram work so hard, for so long, to win our sustained and recurring attention. But ultimately, once they've succeeded (and perhaps 'conquered' is a more apt verb), they take measures to undo and undermine this previous goal.
The cynic in me says that rolling out the aforementioned self-policing functionality is merely a PR exercise to shift their perception as 'enemies of our attention'. And the rational side of me says that they're doing this because the cost of inaction is so sizeable that not addressing these problems would engender an existential threat to their products.