In 2020 and 2021, social media giants have been frequently criticized for allowing COVID-19 misinformation to spread.[115][116] According to Representatives Frank Pallone, Mike Doyle, and Jan Schakowsky, "Industry self-regulation has failed. We must begin the work of changing incentives driving social media companies to allow and even promote misinformation and disinformation."[117][118] President Joe Biden criticized Facebook for allowing anti-vaccine propaganda to spread.[119][120] Multiple social media platforms introduced more stringent moderation of health-related misinformation.[121]