The video-sharing giant will block clips that "maliciously insult someone" based on race, gender identity or sexuality. Plus, what does the British general election tell us about the effectiveness of paid-for social media campaigning? Presented by Rory Cellan-Jones, with BBC tech reporter Chris Fox, and special guest Chris Stokel-Walker, author of "YouTubers".

(Image: Stock photo of a young man in a lonely corridor looking worried by something on his smartphone, Credit: iStock/ Getty Images).