Have an option to enable user to select the date from which the data needs to be fetched.

Follow up from #2105121: Project refactoring & suggestions : Change facebook API to newer version and have it as a separate function..

There should be an option in the administration form, for the users to select the start date from which the data will be fetched. This date will be compared to the post date of the nodes and the data of nodes which were posted on/after that day will be fetched.