I currently have an app called FootyScorer that can manage football tournaments so users can create teams and players and enter the scores for each fixture. To extend this app I know need to allow the user to share a specific event of their choice so that other users can access this event and update the results for the event. Any ideas on how I could implement this? I was thinking about either using Dropbox or maybe Microsoft Azure (but this isn't really working out). In the end, a user should be able to share events to users of their choice so that they can update the scores for the event. The app uses a portable class library to share the code for an Android and iOS project.