I'd be surprised if this was accurate. I've seen average at Facebook of 350k. But, that's the problem, we don't really know as the data is not public.

I would also assume the private company salaries we do know don't include stock options and bonuses.

I think 700k+ is crazy high for a company without a model for much revenue. However, if they can afford it and the people are worth it, I don't think it's a bad thing in and of itself.