Silicon Valley is like USSR in 70s-80s: you can say anything, but for saying things not in the party's line you would be expelled from a higher social class.
Totally, except for the economic stagnation, widespread malnutrition, common alcoholism, kleptocratic gerontocracy, almost every way, and the actual arrests of dissidents.
Oh, and losing a war in Afghanistan also doesn't seem to be in Twitter's immediate future.