GroupMe is a mobile app that lets you create your own social networks to share group messages, conference calls, photos or Google Maps.
Using GroupMe you can create a group with people who are already in your contacts. Once you have created a group you can then text message the group, start an instant conference call, share photographs or share a Google Map showing the location of everyone in the group.
As soon as you create a group you instantly have access to a shared Google Map. The map lets you share your location with the people in your group, find out where your friends are and see them all on a map.
The GroupMe app is available for iPhone, Android and Blackberry.