If you can build a platform whose content is user-generated, and allow users to communicate among themselves, boom.. it’s a definite win. Social is more than just Facebook. You can create your own social application, perhabs for your own campus, community, organization or others.. Ratings, comments, live chat, like and share, enable users to post photos. You’ll be faced with a chicken-and-egg problem initially but once you get over it, the app is most scalable.