Three years ago this month, Google launched a new social network with high hopes of countering the rising tide of Internet users who were flocking to Facebook.

That hasn’t happened. But experts say Google+ has served a valuable purpose for the giant Internet company as the centerpiece of a broader strategy to create a unified profile for each person who uses any of Google’s online products — the better to deliver more targeted advertising, which is highly profitable for Google.

And despite speculation fueled by the resignation of longtime Google+ boss Vic Gundotra, the company says it has no plans to abandon the service.

“Reports of our death have been greatly exaggerated,” said David Besbris, a Google engineering vice president who took over Google+ when Gundotra, a senior vice president, left the company two months ago.

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In his first public comments to a reporter since Gundotra’s departure, Besbris said in an emailed statement to the San Jose Mercury News that Google+ has “hundreds of millions of users (and growing).” He vowed: “We’re committed to building a product that people absolutely love. So, no, Google isn’t giving up on Google Plus.”

Google declined to make Besbris or Bradley Horowitz, a longtime Google+ vice president, available for a formal interview. Gundotra hasn’t publicly explained his departure from the company, though by all accounts he left on good terms.

In his statement, relayed through a company representative, Besbris described Google+ as both a social network and “a social fabric, on and off Google.”

The latter refers to Google’s efforts to make Google+ serve as the identity that people use to sign into other Google services and independent applications, as well as to comment on YouTube and endorse or share things they find on other websites while signed in to Google+.

Google says this helps the company provide a “more consistent experience” to users — for example, by anticipating that you want directions on Google Maps for the restaurant you found with Google’s search engine, then letting you review the meal on Google+.

Analysts say it also lets the company compile a more complete picture of a user’s habits or interests by recognizing them on a variety of services and devices, which in turn helps Google show more relevant advertising. The biggest part of Google’s $60 billion in annual revenue comes from ads tied to Internet searches, but it’s increasingly selling other types of online ads, too.

“The more they can combine what they know about people across all different channels, the better understanding they have for each user, and that’s vital to their ad sales efforts,” said Forrester Research analyst Nate Elliott. When combined, he said, Google’s broad range of apps and services may provide more information than Facebook can glean from its users’ likes and updates.

“Build on our momentum”

Besbris, who led the engineering team that built Google+, posts regularly on the social network and likes to share photos he’s taken of flowers and other things that catch his eye. In his statement, he offered few specifics about his goals for the service, but said he wants to “build on our momentum, build a product that people absolutely love, and make Google Plus the place for meaningful conversations online.”

It’s difficult to gauge how many people are having those conversations. Enthusiasts use Google+ for photo-sharing, video chats and sometimes passionate debates. But it’s never come close to Facebook’s popularity as a digital town square.

“Once in a while, I meet people who are like, ‘Google Plus is my life.’ But I think it’s mostly a small group,” said Chris Abraham, a digital marketing consultant and avid social-media user. Abraham said he gets little response when he shares items on Google+. He thinks many users repost items they’ve already put on Facebook or other sites.

A look at the numbers

Google hasn’t released any user statistics since October, when it said 540 million people worldwide used Google+ credentials to sign in or post comments on any Google service in the previous month.

A smaller group of 300 million visited “the stream” of Google+ itself, but even that figure counts people who merely click the red Google+ symbol that can appear on-screen while using other Google services.

By comparison, Facebook boasts 1.28 billion monthly active users worldwide, although that reportedly includes people who click a Facebook icon to “like” or share something they find on another site while signed into Facebook.

Nielsen researchers use stricter definitions to estimate that 27.4 million U.S. residents visited the Google+ website in April and 45.6 million opened its smartphone app, with some overlap between the two.

Nielsen’s estimates for Facebook were 117.8 million U.S. users on the website and 116.7 million on the mobile app, also with some overlap.