Use social networks to prevent and combat crime
So I was browsing youtube one day and something occured to me. Why don't we create cloud storage to store evidence of criminal activities, sorta like a virtual evidence locker filled with videos, pictures, and audio files.
People could take a photo, or video of something illegal and then upload it to their channel, then tag it and comment on it. they could also copy it to folder dedicated to collecting evidence on a certain subject.
This obviously has flaws but something very similar could be used to allow the people to gather a huge amount of evidence from across town or even the world.