Should time spent on the platform be the determining metric for social media?

As of 2019, 79% of the US population has a social media profile ("U.S. Population With A Social Media Profile 2019 | Statista"). The average person in the UK spends over a day a week online (Hymas). Social media platforms have optimized their platform to make users maximize their time on the platform. That makes the social networks attractive to both investors and business partners. It is important to note that the ad-revenue business model drives such social networks. This means that ad sellers (companies) leverage time spent on the platform to get more attention. For instance, is time…