Mr Zuckerberg said the design focused on "rich stories, visual and engaging, your choice of different feeds...and a mobile inspired consistent UI (user interface)."
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A rollercoaster has come off the rails at a theme park in Scotland, leaving nine children and two adults in hospital.
"I saw a lot of smoke come out from the tail-end of the aircraft. I wondered if it was normal, whether it was just exhaust fumes."
The House of Commons Petitions Committee has said they will keep an eye on the petition and are concerned about fraudulent signatures.