FACEBOOK has stolen a march on rivals by announcing plans for its own internet search engine, raising questions about the privacy of its one billion users.
The social networking website's founder and chief executive Mark Zuckerberg unveiled the service, Graph Search, which puts his company into direct competion with Google.
He stressed the product was "very, very different" to web search engines offered by other tech giants such as Google because it only looks for data on Facebook itself.
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