Foursquare - Foursquare is all about helping you find new ways to explore your city.
Meetup - Helps groups of people with shared interests plan events and facilitates off line group meetings in various localities around the world.
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.
Eventbrite - Discover Great Events or Create Your Own & Sell Tickets
Yellow Pages - YP.com local search connects you with over 19 million local businesses.
Bylde - Bylde is a SaaS platform you can use to Start, Manage and Grow your groups and communities.