What's funny is that anyone with a bit of a forward thinking could have doubled their money today by buying TWTR Inc (which is not Twitter) trading for $0.03 with an identical symbol TWTR, but on another market exchange.
As already happened several weeks before (after it was announced Twitter will be trading as 'TWTR'), the wrong stock exploded due to traders mistakenly placing their buy orders.
It should have been perfectly safe to assume similar would happen on the IPO day. It went from $0.03 yesterday to $0.06 today for a while :)
Just look at this graph over 1 month span: