At the 2:30 mark on the video, Sheriff Fitzgerald says,
"All I can tell you is all of the social media platforms have been searched... "
He adds at the end, "Every app you need a search warrant to go after that company so there's still search warrants out there being served."
That gives me the impression that not all possibilities concerning social media have been searched yet? Of course, I'm not 100% sure what an "app" is. Some others would be better able to interpret the entire meaning of what he said.