TikTok has come under fire after allegedly allowing its users to advertise swords, combat knives and knuckle dusters - with prospective buyers reportedly invited to join encrypted chat groups to purchase them. The app, which has built an enormous usership of 1.6 billion people worldwide since it started gaining traction in 2019, remains one the fastest-growing video-sharing apps in the world . But a number of accounts have allegedly been caught showcasing the weapons - from katana swords and