[Air-L] Facebook Group Research & Tools

All, I'm working with a group of Master's students who are beginning a study examining the messages posted to a large, active Facebook group. First, is there any "must have" literature focusing specifically on Facebook groups? I'm well-versed in the broader Facebook and college student technology use literature but I'm not aware of any good studies in this specific area so your guidance would be appreciated. Second, are there any tools that automate or make it easy to download messages posted to a Facebook group? I'm helping these students search for any relevant tools but it's difficult because the space is extremely crowded with SEO and marketing "tools" and "research." Kevin