Shares in Twitter have ended the day greater than 12% decrease after the corporate reported that its fourth-quarter losses had almost doubled.
The social networking service reported a lack of $167m (£133m) within the last three months of 2016, as in opposition to $90m in the identical interval a yr earlier.
There have been 319 million energetic customers, four% up on a yr earlier, however income from adverts fell barely to $638m.
Donald Trump’s use of Twitter did little to spice up customers or add earnings.
Fourth-quarter revenues have been $717m, 1% up on final yr’s $710m.
Revenues and consumer numbers each fell wanting analysts’ expectations.
It was the corporate’s slowest quarterly income progress because it grew to become a publicly listed firm in November 2013.
Some analysts had anticipated new US President Donald Trump’s extensively publicised use of Twitter would give the service a monetary enhance.
However throughout a convention name, chief working officer Anthony Noto dismissed the concept the “Trump impact” had been a key consider consumer progress.
He mentioned that whereas Mr Trump had proven “the facility of Twitter” and broadened consciousness of the service, it was onerous for “an occasion or a single particular person” to make such a distinction.
Evaluation: Rory Cellan-Jones, know-how correspondent
These have been alleged to be the outcomes that confirmed Twitter resurgent after a yr of disappointment. The truth that it had been the prime social networking battleground in the course of the US election and that each tweet from the brand new president garnered worldwide consideration would have introduced new customers – and advertisers – flocking in.
That was the idea. In reality, the figures confirmed the slowest progress in quarterly income within the firm’s quick historical past and a really modest improve in consumer numbers. The corporate has placed on a courageous face, specializing in the expansion in every day reasonably than month-to-month energetic customers.
It additionally says that income progress is lagging consumer progress – however buyers have grown impatient for proof that Twitter has discovered a sustainable enterprise mannequin.
Donald Trump’s tweets – and the reactions they provoke – might have turn into important viewing for journalists and the markets. Whether or not they make Twitter a terrific vacation spot for advertisers is a distinct matter.
Regardless of the elevated losses, Twitter chief government Jack Dorsey mentioned 2016 had been “a transformative yr” for the service.
“We reset and centered on why individuals use Twitter: it is the quickest strategy to see what’s taking place and what everybody’s speaking about,” he mentioned.
“We overcame the hardest problem for any shopper service at scale by reversing declining viewers tendencies and re-accelerating utilization.”
He mentioned every day energetic utilization had risen for the third consecutive quarter and the upward pattern was set to proceed.
“Whereas income progress continues to lag viewers progress, we’re making use of the identical centered strategy that drove viewers progress to our income product portfolio, specializing in our strengths and the real-time nature of our service.
“It will take time, however we’re transferring quick to indicate outcomes.”