Facebook has announced its new "Graph Search" at its headquarters in San Francisco, California.
Its chief executive Mark Zuckerberg said the company's mission "is to make the world more open and connected", Engadget website reports.
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Nabi Tajima, who was the last known person to have been born in the 19th century, died in Japan after being in hospital since January.
Temperatures are predicted to reach a high of 23C.
Hunt accused companies of "turning a blind eye" to a generation of children "exposed to harmful emotional side effects" of social media.