Facebook will inevitably roll out ads (which is again the reason why WhatsApp's co-founders left),
but it knows that it needs to be cautious about introducing ads in an environment where people go for private communication.
This transition away from public consumption of content on social networks to more private interactions is a substantial vulnerability for Facebook's business.
Mr Zuckerberg has acknowledged as much, comparing this transition to Facebook's earlier shift from desktop computers to mobile
and predicting that making money from stories and messaging "will take some time, and our revenue growth may be slower".
It is unproven whether these new products can ever be as lucrative as Facebook's core offerings.
Facebook's political controversies have not yet dented advertisers' enthusiasm for its platforms but that may also change in the coming year.
Many advertisers have long felt that Facebook is arrogant. Marketers with massive budgets are told to travel to its headquarters in Menlo Park,
rather than staff volunteering to come to them, as is typical in the ad-sales world.
Such gripes aside, the marketing industry has two principal complaints.
The second is that it misleads its customers. Brian Wieser of Pivotal Research in New York, for example, has pointed out to the company
第二个是它误导了客户 。例如纽约的Pivotal Research的布莱恩·维瑟指出
that it was incorrectly promising advertisers that it could reach more 18-34-year-olds in America than actually exist there.
Facebook has still not removed the claim, despite a class-action lawsuit against the firm for allegedly padding its audience numbers.
A senior marketer for a large American bank says Facebook has made mistakes on measuring engagement, reach, views and other data for no fewer than 43 products.
All of the mistakes, he notes, worked in the social-networking giant's favour.
"If these were true errors, wouldn't you expect at least half to benefit marketers?" he asks.
He expects to reduce how much his firm spends on Facebook and predicts that other marketers will as well next year.
At the same time that advertisers' faith in Facebook has been shaken, politicians in Washington are running out of patience with the company.
It seems unlikely that a new law will be introduced that significantly curbs Facebook's activities.
But lawmakers' scrutiny of the firm is causing it to be more cautious about
how it uses data for targeting advertisements and about what information it makes available to outsiders.
That will further diminish its attractiveness in the eyes of marketers.
Mr Zuckerberg and Ms Sandberg are under pressure to prove to users and advertisers that Facebook is not only trustworthy but worthy of their time and money.
If they cannot do so, and the company's share price continues its slide, it is possible that Ms Sandberg will be replaced in the next year.
Mr Zuckerberg controls the majority of voting shares and is unlikely to go. He will doubtless have thoughts about Yahoo's sorry tale.
扎克伯格控制着公司的绝大多数投票权，他不可能离开 。毫无疑问，他将想到雅虎抱憾的故事 。
The onus is on him to show employees, advertisers and shareholders that Facebook won't repeat it.
Technological changes will inevitably lead to unemployment.
That is a very substantial improvement in the present situation.
Record oil prices have dented consumer confidence.
A range of policies have been introduced aimed at curbing inflation.