We're very early in the development of Graph Search.

ENGADGET: Facebook launching 'Graph Search' personalized social search engine, beta starts today (video)

There will be close to 50% growth in costs, and margins will decline as Facebook intends to hire aggressively to support the development of host of features including gifts, graph search, custom audience and app-install ads.

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We expect margins will be lighter as Facebook is hiring aggressively to support the development of a host of features including gifts, Graph Search, custom audience and app-install ads.

FORBES: All Eyes On Facebook's Mobile Growth And Graph Search Progress

It sends data to iPhones (Android's in development) running the Melon app, which translates that info into a focus graph -- generally speaking, the higher the neural activity in your pre-frontal cortex, the higher your level of focus.

ENGADGET

Of course, Graph Search is still clearly a beta product, so it's likely to eliminate such snafus as development continues.

ENGADGET