Facebook founder Mark Zuckerberg's sister on 'oversharing'

The sister of Facebook founder, Mark Zuckerberg, has warned of the impact of being too "attached to our mobile devices".

Randi Zuckerberg, who spent six years working for Facebook, has written a book about the impact technology is having on family life and relationships.

She told BBC Newsnight that social media had given a "voice to the voiceless" but had also created "challenges".