I live in London trihexyphenidyl hcl Twitter has a good story regarding mobile, with 75% of users coming from mobile devices and over 65% of revenue coming from mobile ads. And revenue overall is growing nicely, more than doubling in the quarter ended in June. But the profit margins are lower than some might like, and based on declining prices for ads, it seems that Twitter is still figuring out how to wring more dollars out of advertisers' budgets.