[sindoc]

Well, mainly because of the installed base. It's simply huge. I mean, it's like one of those things that sound easy but that it is actually much much harder to do to achieve. It's not easy to bring so many people on one platforms based on ideas that in Twitter are at least a minimum nuanced, using hashtags, some of the folksonomy stuff that became popular for a while in the early 2000s, which Elon is well aware of.