Sam’s account followed content popular with young teenagers, including sport, gaming, drill music, cars, anti-knife crime pages plus tributes to Olly Stephens.
Instagram repeatedly offered Sam knives for sale in the shop. Other inappropriate content included a person posing with a sword.
YouTube repeatedly recommended videos glorifying gang killings and stabbings, as well as showing off knives and weapons.
Facebook recommended groups glorifying knives, as well as promoting guns and pornography.
After searching for anti-knife crime content, Sam was shown groups, pages and videos selling and glorifying blades on Instagram, Facebook and YouTube.
When we tested moderation, TikTok was the only social media site that removed a post we shared showing a knife.