so it was a classic whodunnit, which is what made it more complex and difficult. >> trooper chris berryare saying online. >> we're combing through everything. just hours and hours. go on the page and just dissecting every picture, every message, everything. dates, times. you find out a lot. everybody posts their whole story on facebook. >> and he admitted at the time, he's like, "i didn't even know what a retweet was." so he had to become fluent almost as he had his boots on the ground. >> still to this day, i don't like twitter. it was just one of those things i never got into, and it was hard to follow and hard to figure out. >> the kids had all these concerns and information, and they used twitter and facebook to voice their opinions. >> there was so much to dig through, so many digital artifacts to put into one column. like, this is relevant or this is irrelevant. but it's a lot of noise, and it's a lot of volume. >> but berry gets up to speed quickly and soon finds himself in a pile of digital posts. what he notices is technology has changed, but human behavior has not. >> well, an