Social media usage has grown as a result of the COVID-19 crisis, as more users go online to stay connected with family, friends and colleagues. Now, new data from insights and consulting firm Kantar reveals exactly how much some apps are benefiting. According to a survey of more than 25,000 consumers in 30 markets conducted from March 14 to 24, WhatsApp is the social media app that has experienced the greatest gains due to COVID-19.