Gunning to win more advertising dollars, Facebook Inc. (FB) is using new ways to cull personal information from outside the social network and match it with data submitted by its billion-plus users.

The efforts are winning over advertisers such as General Motors Co. (GM) and Neiman Marcus Group Inc., but further raise privacy concerns as Facebook harnesses a mosaic of information about its users.

On Wednesday, Facebook plans to roll out a new advertiser tool to help advertisers directly target Facebook users based on their offline spending history.

The tool marries what Facebook already knows about people's friends and "likes' with vast troves of information from third-party data marketers such as Datalogix Inc., Acxiom Corp. (ACXM) and Alliance Data Systems Corp.'s (ADS) Epsilon. That includes data on the Web pages that consumers visit, the email lists they have signed up for, and the way they are spending money online and offline.

A data broker like Datalogix, for example, aggregates information about which items and brands a consumer buys through sources like loyalty-card programs. Through software that obscures users' identifying information such as email addresses and phone numbers, Datalogix and Facebook can combine their databases, and group users based on their offline purchases. Then, through the "partner categories' tool, brands can select which groups should see their advertisements.

A review of the "partner categories' tool by The Wall Street Journal found that categories often apply to tens of millions of people--for instance, there are some 20 million U.S. users who are heavy juice buyers on the social network.

A small chocolatier can target young parents in New York who buy lots of organic food products, for example. Hyundai Motor Co. (005380.SE) recently ran a test to send ads to people identified as "intenders," or those likely to buy a car soon based on their use of auto-research sites.

While Facebook doesn't provide data on individuals to advertisers, it now can feed advertisers information on broad swaths of its members, including their behavior outside of the social network.

The latest moves sit uneasily with some members who are worried that Facebook knows too much about their lives.

As it broadens its network of data partners, Facebook is creating an increasingly detailed composite of their behavior, from what products they're buying at the drugstore to sexual preferences and predicting what big purchases they may be contemplating.

"There's no place to be left alone," said Jeffrey Chester, executive director of the Center for Digital Democracy, a Washington, D.C., policy advocacy group. He said Facebook's relationship with data partners could become more worrisome if Facebook leverages the location data it passively collects from mobile devices to sell ads.

Mr. Chester added that he has asked the Federal Trade Commission to investigate Facebook's targeting efforts. Separately, the FTC has said it is looking into how nine data brokers, including Datalogix and Acxiom, are collecting and using information about customers.

The FTC and Acxiom didn't immediately return requests for comment. Datalogix Chief Executive Eric Roza said in a statement: "The intersection of online advertising and marketing data is evolving rapidly, and Datalogix has been happy to help the FTC increase its understanding of our industry."

Facebook said it isn't using location data from smartphones to target ads and that it has created a program to make anonymous data between itself and its data partners. Facebook members can also click on ads for information on why they were targeted and can opt out of future ads from that specific advertiser or from receiving all targeted ads from each data partner.

"We are committed to building things that make it clear to people how their privacy is protected and how they can control the ads they see," said Brian Boland, Facebook's director of product marketing, of his message to advertisers.

Mr. Boland said the extended web of data is aimed at serving more relevant ads to consumers and convincing advertisers that activity on the social network leads to actual transactions.

General Motors, for one, is returning to advertising on Facebook on a trial basis after walking away nearly a year ago. Using the new tool, the auto maker is targeting younger buyers who might be interested in its Chevrolet Sonic subcompact car, said two people familiar with the matter. The Sonic promotions are only exploratory at this point, and GM remains cautious after dropping Facebook as an advertising resource in May 2012.

Neiman Marcus Group also is ramping up its ad spending on the social network after cutting back two years ago. The company previously could only target ads based on limited actions on Facebook--such as a user's "like" of a company page. Now the upscale retailer can push mobile or desktop ads specifically to Facebook users who regularly spend on high-end apparel or those who looked online at making a clothing purchase but didn't pull the trigger.

"Facebook was a black box," but "now we can deliver targeted communications," said Neiman Marcus's vice president of digital marketing, Aaron Shockey. Mr. Shockey said early data suggest Facebook ads using the targeting methods are comparable to Google Inc.'s (GOOG) search ads in driving sales. He declined to be specific or to comment on how much spending on Facebook ads has increased.

How much the ad targeting has helped Facebook's business is unclear, since the Menlo Park, Calif., company doesn't break out revenue from specific ad products. But in Facebook's first quarter--the first full quarter after the debut of some key targeting products--advertising revenue rose 40.9% from a year earlier to $1.3 billion.

Shiv Singh, head of digital for PepsiCo Inc.'s (PEP) beverage business, said PepsiCo's spending on Facebook ads has gone from modest to "significant" since the social network introduced targeted ad products. He said he was long skeptical of Facebook "likes' because it provided little clarity on how those users buy soda.

But now Mr. Singh said he can show different ads based on whether a user regularly buys Diet Pepsi, is a Pepsi loyalist or is a so-called Pepsi switcher--someone who tends to flip between Pepsi and its rivals and is typically more price sensitive.

"That's really powerful and unique," Mr. Singh said. He added that his group's more targeted marketing efforts on Facebook reach 18 million to 20 million people every month versus less than three million a year ago.

Sean Williams, social media manager for Hyundai's America group, said he was also pleased with a recent Facebook ad campaign that helped result in a 28% lift in sales. Mr. Williams said Hyundai plans to tinker with Facebook's targeting tools over the next year to find new ways to reach high-potential consumers.

"In the past, we really just used Facebook as an engagement tool," Mr. Williams said. "We're now thinking about turning this into an evergreen, or always on, program."

-Jeff Bennett contributed to this article.

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