Facebook rolls out friends-based 'graph search' tool

Shares in Yelp dived more than 6 percent on fears that Facebook's new friends-based search concept will begin to draw users away from the popular reviews site, which also lets people maintain a circle of trusted friends. Google stock held steady.

Some analysts said Facebook may be taking a tiny step toward eventually challenging Google on its home turf, but said that was a much more challenging undertaking and a long-term possibility at best.

Zuckerberg stressed that the new graph search did not encompass Internet searches, Google's specialty.

Sterne Agee analyst Arvind Bhatia said the product was inevitable. "We think this will enable them to expand beyond display ads and ultimately compete with Google," he said.

THE PROMISE AND THE THREAT

The world's largest online social network, Facebook is moving to regain Wall Street's confidence after the IPO and concerns about its long-term financial prospects.

Much of Facebook's recent focus has been on making money from users who are migrating to mobile devices. Zuckerberg said he could foresee a business in search over time, but analysts advised caution. Facebook has come under fire numerous times for unclear privacy guidelines.

While Tuesday's revelation fell short of some of the wilder guesses about what Facebook planned to reveal in its highest-profile news briefing since its market debut, analysts said it was overdue for a well-rounded search tool, given its current inadequacies.

Wedbush Securities analyst Michael Pachter argued

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