It would be quite a challenge to re-create what FB circa 2006-2010 or so was like. Before influencers and engagement farming. Before it became "social media" and was just a "social utility"
The problem is that even if you re-built that product, it would quickly get overrun by engagement optimizers. If the product is open, they'll rush in.
Group chat apps somewhat fill this product void, but not completely. There was something magical about a social network being somewhat open & organic that group chats can't capture