Allie Navarro can't wait to show her best friends the app she built at CodeGirls summer camp. Click'd pairs users based on common interests and sends them on a fun (and occasionally rule-breaking) scavenger hunt to find each other. And it's a hit. By the second day of school, everyone is talking about Click'd. Watching her app go viral is amazing. Leaderboards are filling up Everyone's making new friends. And with all the data Allie is collecting,...