main character

Noun

 * 1)  A person who becomes a focal point of discussion on a social media platform (particularly Twitter).
 * 2) * 2020, Paul Farhi, "How the dusty old op-ed pages became the red-hot outrage-generating machine of 2020", The Washington Post, 28 December 2020 (image caption):
 * With his Jill Biden essay, Joseph Epstein became Twitter’s main character this month.