Is social media built to be addictive?

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The world's largest social media companies have been accused of creating "addiction machines" at a landmark trial in California examining the mental health effects of Instagram and YouTube. The companies also maintain they are not responsible for content that third parties post under federal law. We hear from parents around the world. Future editions of the Winter Olympics could be moved to January in order to benefit from more snow and colder weather. We speak to people who compete in winter sports to hear how climate change is affecting their work. US news presenter Savannah Guthrie has said her family believes their abducted mother is still alive, as she issued a new appeal to anyone with information. We bring you the latest. Presenter: James Reynolds Photo: Social media applications are displayed on a mobile phone Credit: REUTERS/Hollie Adams