> We see 1.44 billion monthly active users. That translates to about $12 a year per user.
No, the $4 Billion in revenue was last quarter. In other words $48/user annually, not to mention the huge growth of even that number. That's why its market cap is ~$300 Billion.
> Twitter can't break even. They report 320MM monthly active users which means they're pulling in about $7 per user per year in revenues, less than Facebook, and with a growth curve that's even more alarming.
Twitter could fire 90% of its staff today and keep bringing in that same amount of revenue, being wildly profitable. But it doesn't because it's still trying to grow quickly. It also just barely started turning on revenue.
You're actually the one thinking about this the wrong way. Profit alone is just a bad way to value quickly growing companies, as it never carries all of the nuance (see Amazon - http://a16z.com/2014/09/05/why-amazon-has-no-profits-and-why...).
You're also not appreciating the growth. There's a reason PG says "startups = growth"; because growing 25% month over month compounds and gets really big really fast.
> And, mark my words, in 5 years [uber] will be shut down by regulators and class action lawsuits as folks realize they're making $10B a year on the backs of illegal contract workers.
In most cities they're not "illegal contract workers" even today. I'd bet good money that in 5 years few, if any cities, would call Uber drivers "illegal contract workers."