Write Facebook App that will post scheduled messages to groups

The app will be installed on a web server. Features will include: 1. User can search for Facebook Groups in any niche through graph search. 2. User can create different category and add similar Facebook Groups to each category. 3. The app must be able to automatically join groups in all the categories at once or each category separately from Facebook account user indicated. 4. User can add message, message title and image to the app for posting to all groups in the selected category. 5. The messages can be posted immediately or user can schedule different messages for different time schedule to be posted to any selected category.