The tech mammoth, which claims Instagram and WhatsApp, said benefits sank 16% in 2019 to $18.4bn (£14.1bn).
The fall came in spite of the proceeded with soundness of its promoting business, which saw income rise 27% a year ago.
Offers in the firm dropped over 6% in twilight exchange.
Facebook frightened financial specialists in 2018, when it cautioned that its endeavors to expand security insurances and substance control on its foundation would hit benefit.
The tech monster has confronted analysis over its treatment of phony news during 2016 decisions, just as the ill-advised sharing of client information with Cambridge Analytica. All the more as of late, its choice not to police political adverts on its site for bogus substance has experienced harsh criticism.
In July, US controllers declared a record $5bn fine against Facebook to settle protection concerns.
On Wednesday, the firm additionally said it had consented to pay $550m to settle an Illinois claim over its utilization of photographs for its facial acknowledgment innovation.
Facebook boss Mark Zuckerberg said that he expects the firm will keep on winding up in the spotlight, as it shields its help of focused promoting and encryption.
“My goal for this next decade isn’t to be liked but to be understood,” they said. “In order to be trusted, people need to know what you stand for.”
Offers dove following its 2018 estimate, however they had bounced back a year ago, as client development and promoting incomes stayed solid, in spite of progressing examinations.
On Wednesday, Facebook said a normal of 2.26 billion individuals were dynamic on its group of stages every day in December, up 11% from a year sooner. Facebook alone checked a normal of 1.7 billion dynamic clients every day during the month, up 9% – in front of desires.
“Facebook can’t avoid change though,” said Sophie Lund-Yates, equity analyst at Hargreaves Lansdown. “The Cambridge Analytica scandal intensified regulatory scrutiny, and tightening data security as well as fighting fake news is an ongoing – and expensive – challenge.”
Facebook detailed more than $70bn in income for 2019, up from $55.8bn the earlier year. In any case, costs rose quicker, expanding 51% to $46.7bn, driven by lawful expenses.
Facebook cautioned that further expenses were yet to come, as development eases back due partially to new security guidelines.
“While we have experienced some modest impact from these headwinds to date, the majority of the impact lies ahead of us,” chief financial officer Dave Wehner said.