Facebook to upgrade its search engine

Facebook has announced a major addition to its social network a smart search engine it has called Graph search.
The feature allows users to make "natural" searches of content shared by their friends.
Search terms could include phrases such as "friends who like Star Wars and Harry Potter".
Founder and Chief Executive Mark Zuckerberg insisted it was not a web search, and therefore not a direct challenge to Google.

However, it was integrating Microsoft's Bing search engine for situations when Graph Search itself could not find answers.