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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Heavy rain has caused widespread flooding and travel disruption across north west England and North Wales.
The actor said he did not remember the latest allegation, but apologised for “inadvertently” causing discomfort.
Drinking three or four cups a day compared to drinking none was linked to a lower likelihood of developing cardiovascular problems.