Data collection from a Facebook public page (Graph API)

Work summary: For my empirical study I need from a public Facebook group (no password required) shared information throughout a specific time period (such as Sept. 2009 – Sept. 2013). This should be done via Facebook Graph API. Detailed information: Since the Facebook group is public it is possible to see all shared information, membership is not required. I need for each post the ID of the first sender, day and time of the post, the full information (text) in the post. In addition to that if there are any likes, shares or comments on this post I also need the same information for each like, share or comment. In summary I need the information diffusion tree of a specific Facebook group page. This information should be collected in a structured form (e.g. excel sheet). Required Information: 1. first sender of the post, date and time and the complete text 2. the comments to this post, date and time and the IDs of the commenters 3. the likes to this post, date and time and the IDs of the likers 4. the shares of this post, date and time and the IDs of the sharers 5. If the first post has been shared, any likes, comments and shares on this, date and time and the IDs of them. 6. Number and list of friends of each actor mentioned above.