Twitter is tumbling after reporting zero user growth (TWTR)

Twitter is tumbling in pre-market trading, trading down 9.73% at $17.71 a share.
The social media company reported no monthly active user growth in the second quarter, which was one of the main metrics investors were looking for.
The company missed on user growth, but grew its revenue in the second quarter. Twitter reported revenue of $574 million, which beat Wall Street's estimates of $537 million. Earnings per share also came in higher than expected at $0.12, compared to the $0.05 expect