I don't really know these things but as far as I can tell what Google did was something really unpopular that only what Google used to be could do: they only al

I don't really know these things but as far as I can tell what Google did was something really unpopular that only what Google used to be could do: they only allowed the "right" VCs to invest to their conditions, and they were not interested to the reaction of bankers and alike, and everybody wanted the Google shares. Twitter was nowhere in such a kind of predominant position given that is in a weaker situation (it is not clear if it will ever make enough money to justify even the IPO initial price).