Facebook friends is a small part of the social graph. There is a graph of people who are not your direct friends but share similar interests by virtue of belonging to a group. This aims to tap in to that graph. Thanks for providing your opinion and to be fair we have considered those points. We will never compete with Ebay and Craigslist and for the target market that are successful in selling/buying items there this definitely will not be appealing. Is there a pool of people who would rather put stuff on a virtual garage sale as opposed to a craigslist post? if such a pool exists then this idea would sound appealing. We might be targeting a super niche market and valuable feedback like yours helps us understand how niche that is.

Another target audience is kids buying text books. If a freshman had a place to see all books shared with a study/dorm/sorority facebook group, wouldnt that be more beneficial/cheaper than buying off Craigslist or Ebay? Would he choose to check in that place before looking at the other sites? If the answer is a "maybe" or "yes" then we would love to explore that.