A sharp uptick in thefts of Hyundais and Kias over the past two years has been linked to viral videos posted to TikTok and other social media platforms that teach people how to exploit a security vulnerability to steal the cars. Police and others say despite voluntary fixes from the automakers, waves of thefts have continued, illustrating the lingering effects of dangerous content that gains traction with teens looking to go viral. Police departments are frazzled, attorneys generals have urged federal intervention and cities and consumers have resorted to lawsuits to hold car companies accountable. Still, some point the finger at social media platforms unable to remove content at the breakneck speed it appears.