Create plugins for FB, Instagram, Telegram, etc...
TBH most of my friends don't use FB/Instagram/Whatever in the intended way mostly for sharing "stories" which I think is now replacement for something like short status text that used to be in messaging apps. I would say insta/fb stories/bereal. The problem is also that this is integrated into main communication app which is Messenger for most of people. There is little hope to replace something with such network effect as it.