They get their news from facebook as the news/media organisation posts updates to their feeds, which they can share with others via WhatsApp or messenger. No need to visit the news sites it's all there.
They get their local second hand marketplace through Facebook Marketplace, no need for eBay et al.
They get their local community updates, gossip, business recommendations etc. through Facebook Groups. No need for nextdoor or neighbourhoood specific websites/forums.
They can find local businesses through the Facebook as the businesses have a Page that describes what they do, testimonials from previous customers, bit of a social feed to add some personality/'blogging'. Contactable through messenger. The businesses don't need to setup a website, Facebook offers all the tools.
You never have to leave, especially on iOS/Android if you use the facebook app. Even links to external sites are rendered in a webview, so no need to look at URLs.