The owner of Instagram and Facebook has been testifying in a landmark legal case over social media addiction, which could pave the way for future hearings.

Also on the programme: Les Wexner, who gave Jeffrey Epstein his own fortune to manage and who was pivotal in his rise as a financier, has told a Congressional inquiry he was naive and was duped, but not himself involved in sexual abuse. And the widow of the Hollywood actor Chadwick Boseman tells us about the revival of "Deep Azure," a play he wrote twenty years ago, in London.

(Picture: Mark Zuckerberg arrives in court. Credit: Reuters)