Mark Zuckerberg Announces -Facebook Graph Search 'will threaten Google+

However, analysts warn that without increased activity the usefulness of the new search feature could be limited.
Facebook announced Graph Search at an event .He says the search tool is designed to link up the vast store of information in Facebook's database, making it possible for members to search for friends based on their interests or even for friends of friends.
Demonstrating the feature last night, Mark Zuckerberg gave the example of a recent gathering at his home to which he invited friends based on the search "who are my friends in Palo Alto who like Game of Thrones", the popular fantasy drama.
"Facebook's worst nightmare is a static social graph; if users aren't adding very many new friends or connections, then their personal network becomes less and less active over time," says Forrester's Nate Elliott. "Terrifyingly for Facebook, that threat is very real: We haven't seen significant growth in the average number of friends per user recently."
Elliott adds: "Graph search seems designed to encourage users to add more friends more quickly. If it means users' personal networks change more frequently, and become more active, then that keeps them coming back to the site - which is vital to Facebook's success."