Fortnite as a communal hangout area, a 'third place':
https://char.gd/blog/2018/fortnite-is-the-new-hangout-spot
https://medium.com/s/greatescape/fortnite-is-so-much-more-than-a-game-3ca829f389f4
It's also really impressive to build a successful app across PC, consoles and Android, with everyone playing together!