We have developed an Android App that allows you to locate all your friends in a big event. For starting session isn't neccessary to create an user account, we use the Google+ API. Even more, we used ESRI API.
If your project has been nominated for global awards, please embed here your 3-minute Youtube presentation. (Select "Insert" --> "Youtube").
Juan Luis Perez
If your project has been nominated for global awards, please indicate the global prize for which you wish to be considered. Please select only one prize. The global awards details are here.