During the game, every time there's a red card, a goal, or even a crazy biting incident, the analysts are on it. They're looking for huge spikes in certain search queries when exciting things happen. In this match's case, one of the top questions in Brazil was, "What are the players going to say about the match?" Since, you know, Germany completely owned them.
When something major hits their radar — like when the term "cumbia," the name of the Colombian team's victory dance, surged after the first goal of Brazil vs. Colombia — they'll send the numbers to designers and writers so they can start moving on getting the trend to the hub page.