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Slow growth in the number of active messengers affected the value of the action.
Source: BBC
Reuters
Fejsbuk's performance prices fell by more than 20%, while user activity was below expectations.
A drone network, criticized for the use of private user data and newswires, had 2 23 billion active users at the end of June.
This is 11% more than in June 2017, the lowest growth of the last two years.
The company warned investors that rising costs would increase revenue growth in 2019, which would affect profitability.
Fejsbuk anticipates sluggish revenue growth thanks to the ability of new users to reduce the number of visible ads and the number of less profitable users.
The company, which also owns Instagram and Vatsap, is investing in new technologies such as virtual reality and video.
Fejsbuk's stock price first dropped 12% after being rewarded in New York, but losses were suffered when the company presented its cost forecast for the next period.
Danijel Ivs, chief strategist at GBH Insajt, said that the forecast of the company "ninth sea".
"They have been disappointed with the forecasts for the second half of the year and 2019. This will certainly affect the actions in the coming period," he said.