Looks nicely designed and maybe fun to use, but I can't imagine (and the website certainly doesn't help one imagine) a reason for using this instead of Google other their one provided use case of taking a picture of some unknown object and asking the community what it is.

Even with that, you could just post that photo and question directly to facebook, thereby cutting out this app which seems to serve as a middleman between a user and his or her already existing social networks.