To be frank I have used it since it started way back and it continues to have the best user experience among messengers. I myself don’t use it for any crucial information but as a messenger with it’s featureset it’s second to none. When a better alternative pops up which will have a better UI and such an extensive featureset I will probably switch over
Those two are really the only good use cases today for facebook. Insane how Marketplace pretty much overnight almost killed local listing sites. Events I don’t see good alternatives, don’t have much hopes for that one, time will show