New York - Twitter Inc’s said average monthly active users stalled in the fourth quarter - the first flat quarter sequentially since the company listed in 2013.

Twitter shares fell 6.6 percent at $13.99 in after-hours trading, after the social media company’s revenue forecast for the current quarter missed analysts’ expectations.

The weak results will stoke investor concerns over the company’s stalling growth and the effectiveness of Chief Executive Jack Dorsey’s turnaround strategy.

The company’s shares have more than halved in value since Dorsey, one of the founders, returned to Twitter in July.... Read More: VIN