TL;DR Twitter gave the police information about the phone number which registered the account that sent the seizure-triggering gif AT&T gave the police inform

TL;DR Twitter gave the police information about the phone number which registered the account that sent the seizure-triggering gif AT&T gave the police information that is was a Tracfone prepaid account with an associated toll record that was an iphone Apple gave them access to his cloud account which had all the incriminating details needed including email / picture of him with his drivers license and data about the victim