Twitter's first quarter revenues

Revenue for the first quarter of 2015 totaled $436 million, an increase of 74% compared to $250 million in the same period in 2014. Mobile advertising revenue was 89% of total advertising revenue.

"While we exceeded our EBITDA target for the first quarter, revenue growth fell slightly short of our expectations due to lower-than-expected contribution from some of our newer direct response products," said Dick Costolo, CEO of Twitter.