Not sure if I see a bad thing in this. I'd like too know what old friends are currently up to and checking their social media has been a way to do so during the golden age of facebook. Lately I feel more value in connecting with them personally, talking and letting them now, that I am still interested in what's going on for them.
I suppose the app will then mostly be full of throwaway comments in the form of "Cool" or "Wow". But maybe add a modifier that if the poster doesn't have any meaningful reply to a commenter's (let's name him Elon) comment, then the poster's next content will not be shared with Elon next time.