"Foursquare
Foursquare is a location-based social network that lets you "check in" at venues using your phone or mobile device. You can then connect with other Foursquare users to share information about where you are and what you are doing. The program also allows you to search your location for the restaurants, bars, shops and other amenities, and receive personalized recommendations based on other users' experiences.

Nextdoor
Critics argue that the impersonality of the Internet has compromised the once thriving sense of community in America's neighborhoods. Nextdoor's mission is to rekindle this community spirit in neighborhoods across the U.S., by connecting users and their neighbors through a localized social network.

Users join with their home address and are automatically placed into a home neighborhood. This ensures that all of the content, connections and messages you see will come from other users living in your area.

Roamz
Roamz isn't so much an alternative to traditional social networks as it is a new way to embrace them. This mobile app gathers data from Facebook, Twitter, Instagram and Foursquare and alerts you to the most interesting or significant things going on around your local area. This information is gathered to your mobile device to provide you with an inside view on the best things to see and do in your local area.

Similar to a cross between Google and Facebook, the social network also allows you to post status updates and share photos." - Foxnews.com