OK, it's true that its stock price is high enough that the market has priced it above the rest of the entire automotive industry. but that price will undoubtedly crash, and it's not the biggest car company by any realistic or stable metric.
they've been slashing their prices and they make cars which catch fire. they've been around a decade and they still haven't turned a profit.
and again, what's the huge payoff going to be with Twitter?