I was also reminded of Like a Little and Shoutflow. Apparently, their website is defunct now but I found an old article about it: http://www.addictivetips.com/mobile/discover-like-minded-peo...

It would be helpful to research why some of these social discovery apps did not work and ensure Shoutt doesn't make the same mistakes. Like a Little went on a rage for many months and then started plummeting. Personally, I love the idea though! Good Luck!