TL;DR: Facebook Groups (63% usage) win on convenience but you rent the audience and the algorithm; Discord (48% two-year growth, 2.3x real-time engagement) wins on liveliness but skews young and chaotic; owned platforms (groups you control, like YRUZ Groups) win on ownership, data and monetisation. Choose rented for experiments, owned for anything tied to income — and read How to Move Your...