Attacking an outsider makes them all insiders. - Paul Graham

If you want to start a startup and don't know what to build, one way to get ideas is to ask if there's something you could create that would help your peers to make money. Any startup that helps people make money tends to (a) be popular and (b) make money itself.

In our world, you sink or swim, and there are no excuses.

Twitter won't last forever. Nothing does. But whatever motivation ends up driving a successful "next Twitter," it's unlikely to be the fear that Elon will start allowing people to say heterodox things on the original Twitter.