Tech

This One Simple Metric Is (Probably) Holding Facebook Stock Below $55

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Facebook CEO Mark Zuckerberg: Not where he wants to be.  Reuters/Robert Galbraith

One Wall Street analyst expects Facebook stock to hit $72.50, but the price remains around $54.

On average, Wall Street analysts are expecting Facebook to eventually hit $58, but for weeks now FB has failed sustain a rally over $55.

And we're all about to start hearing a lot of yelling about Facebook's business "slowing down."

There is one metric that's causing all the fuss: comparables.

More specifically, tough comparables: In the finance world, analysts compare this year's number to the same number last year at the same time period — as opposed to the most recent previous number from one quarter ago. This helps them figure out how companies are growing year to year, and it knocks out any seasonal bias from the holiday shopping seasons of summer and winter.

But comparables also distort a company's business when, for instance, a year-old line of revenues are being compared to the year-before period, when they didn't exist.

Facebook has previously benefitted from such a distortion, but in Q4 it will get the other end of the stick:

Back in Q2, Facebook’s stock got an enormous boost when investors belatedly realized that the company’s mobile ad business was turning out to be huge. Facebook benefited from the fact that its mobile ad revenue number was being compared to the Q2 2012 number — a time period when Facebook didn't have any mobile ads.

Then, in Q3 2013, the mobile ad revenue number — about $1 billion — was initially welcomed, but investors became more cautious when CFO David Ebersman began talking about a loss of teen activity on the site during the conference call with analysts.

Facebook, of course, only began its mobile ad program in earnest back in Q3 2012.

So Facebook’s Q4 2013 earnings — and specifically its mobile ad business — will be compared to its Q4 2012 number, a time period when mobile ad revenue was up and running nicely at Facebook. Facebook had about $364 million in mobile ads that quarter.

The Q4 number will still be a huge increase in mobile ad revenue, but the percentage increase will be smaller.

So expect to hear a lot of screaming about "Facebook's mobile ad business is slowing down!"

It's probably not slowing down, it's just that the comparables are tougher.

Disclosure: The author owns Facebook stock.

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Jim is the former editor-in-chief of Insider's news division.Previously he was the founding editor of Business Insider UK.He has also been managing editor at Adweek, an advertising columnist at CBS Interactive, and a Knight-Bagehot Fellow at Columbia Business School. His work has appeared in Slate, Salon, The Independent, MTV, The Nation and AOL.His investigative journalism changed the law in the US First Circuit Court of Appeals (U.S. v. Kravetz), the Third Circuit Court of Appeals (North Jersey Media v. Ashcroft), New Jersey (In Re El-Atriss), and New York State (Mosallem v. Berenson).The US Supreme Court cited his work on the death penalty in the concurrence to Baze v. Rees, on the issue of whether lethal injection is cruel or unusual.He won the Neal award for business journalism in 2005 for a series investigating bribes and kickbacks in the advertising business.Here's a selection of his past stories:   • The alleged betrayal in these photos, texts, and emails cost Snapchat $158 million   • Inside the conspiracy that forced Dov Charney out of American Apparel   • The Evolution of Ev: The creator of Twitter, Blogger, and Medium has a plan to fix the mess he made of the internet   • THE "KNOCK-IN SHORT": Nigel Farage and the massive bet against the pound on the night of the Brexit vote   • eBay worked with the FBI to put its top affiliate marketer in prison   • How Dunkin Donuts ended up hiring a psychotic credit card thief as director of communications   • BEJEWELED: The definitive, illustrated history of the most underrated game ever   • The CEO of Publicis told us how he stared down a furious internal rebellion to bet the future of his $11 billion company on artificial intelligence   • FBX: The billion-dollar Facebook business that never happened   • The €150 million check-kiting scam that bankrupted Leo Burnett in Greece   • My Polaroids of the September 11 attacks led me into America's secret court system for terrorist suspects   • YouTube deleted 130 rap videos to help police fight street gangs responsible for thousands of stabbingsDisclosure: I own shares of Twitter (TWTR).