The last one to slowly decay into a festering pool of goop, colonized by competing microorganisms seeking to dominate the goop with their own tiny idea of what success looks like, while higher ad-versaries extract sustenance from them and the goop for a short while, until a sticky dead equilibrium is reached.
I suspect outlast will be either twitter suffers some massive temporary outage that shakes confidence in the service as a whole or the venture itself collapses.
Is it massive enough to form a black hole when it collapses or not massive enough so it only goes super novae instead? It's not like it's Facebook size