Twitter's ad revenue per view is falling

"More people are using Twitter more often, but the company isn’t generating as much advertising revenue each time people refresh their feeds.
Twitter’s first-quarter revenue of $250 million beat analyst expectations, but the stock fell to a new low in after-hours trading. That may be because Twitter’s user growth remains modest: About 255 million people now actively use the service, up from 241 million at the end of 2013.
But the most alarming figure is that Twitter generated $1.44 in advertising revenue for every 1,000 timeline views, down from $1.49 in the previous quarter. That’s the best measure of the company’s ability to make money from its existing base of users, and it’s going in the wrong direction."

Source:  Quartz, 29th April 2014