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App users can create a list then share it with other users. Users must sign in to the app with your their Google account. All list must sync with a cloud service or database hosted by me. List can be changed by the original user and the shared users and sync with each change. A change log for each list must be kept along with a back-up. If app can sync with a MySQL database I can build site to change lists online. App will be ad supported based on info from lists.
App to be supported by Jellybean and above. Potential for iphone app as well.