Facebook founder Mark Zuckerberg said the social networking site's News Feed "is one of the most important things we have built", ahead of an expected revamp to the service.
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After the man fell onto the tracks at a central Sydney station, six other men jumped down onto the tracks to help him.
The unnamed woman is the first ever to complete the famously gruelling marine officer training since the job was opened to women.
The competition watchdog says the site's contractual arrangements with insurers that could result in higher home insurance costs.