Searching for location-based forum/blogging/maps examples


I’m looking into building a location-based mobile App that is sort of a mash-up between yelp, trip-advisor, and pocket (for offline reading). The goal is to make local knowledge & travel tips available for people transitioning into an expat community. I’m searching for good examples of micro-blogging, forum, maps, and location-based apps/components that would be useful for this project. Would welcome tips for anything that works with ionic/angular/cordova plugins.