The diminution of personalization algorithms and virality also plays into how Snapchat treats news. Snapchat’s primary format is called a Story, a slide show of a user’s video clips that are played in chronological order. This, too, is an innovation; before Snapchat, much online content, from blogs to tweets, was consumed in reverse chronological order, from the most recent to the oldest. Snapchat’s Stories, which have since been widely copied, ushered in a more natural order — start at the beginning and go from there.