Meetup - Helps groups of people with shared interests plan events and facilitates off line group meetings in various localities around the world.
Yelp - The free Yelp mobile app is the fastest and easiest way to search for businesses near you. Download it now to get started.
Eventbrite - Discover Great Events or Create Your Own & Sell Tickets
Foursquare - Foursquare is all about helping you find new ways to explore your city.
Bylde - Bylde is a SaaS platform you can use to Start, Manage and Grow your groups and communities.
Tripadvisor - The Tripadvisor mobile app is available for the Android and iOS platforms. It can be used to create reviews of hotels, restaurants, and to chat with other travelers on Tripadvisor forums.