https://bonfirenetworks.org/

I define "important conversation" as informative or consequential conversation between influential people, politicians, philosophers and academics. (The kind that's rare on twitter due to the char limit, might become a lot more common in a place without one, or, who knows, substantial conversations between influential people might end up remaining rare in public because incentives.)

Although I'm not asking about general popular adoption (as I don't care about that) note that this is likely to be a precursor to broad adoption. People will go where the news is happening.