Maybe I'm a generation younger than you, but if you were young when Snapchat was cool, then you probably transitioned to stories from the "main" IG content and dropped Facebook altogether. I spend 90+% of my time on IG on stories and it is a really good way to keep up with people as far as generally knowing where they are/what they're up to. I probably post once a month for reference.
Ah, this is about instagram stories! Yes, definitely know peers who use that. I was thinking Zuck was referencing facebook stories, which seem like a flop.