A look at Facebook Groups, used by two thirds of Facebook's MAUs and a company focus since 2017, which make leaving the platform especially difficult (Heather Kelly/Washington Post)

Heather Kelly / Washington Post:
A look at Facebook Groups, used by two thirds of Facebook's MAUs and a company focus since 2017, which make leaving the platform especially difficult  —  Facebook invested heavily in the one feature it knew people couldn't leave behind: Their groups  —  Before the pandemic, Andrea Norrington barely checked Facebook.