Twitter user growth stalls in fourth quarter of 2015

Twitter’s average monthly active users stalled in the fourth quarter of 2015 — the first flat quarter sequentially since the company listed in 2013.

The news last night sent Twitter shares falling 6.6% 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.