Cops frequently go to social media to get leads in investigations. Plenty of property crimes that get solved because the dumb ****s who commit them post instagram pictures on which the loot is clearly visible. Felons who got arrested after they posed with firearms they were prohibited from possessing etc. I talked to the deputy who covers our local high schools, a good part of his work is keeping an eye on the social media 'chatter'. He has a few different profiles and through the 'friending' and 'tagging' system many of the kids dont know that everything they post gets back to officer friendly. Whenever we have those 'social media threat' or 'gun in the school' incidents, they usually get cleared up pretty quickly.