(Bloomberg) -- If you watch the Cleveland Browns, there’s a good chance they’re watching you too.

For the past few years, the Browns have been compiling extensive, individual profiles of their fans. Pulling together data from ticket sales, merchandising, concessions and even web traffic, the National Football League team can cross-reference basic contact information with games attended, souvenirs and snacks purchased. They even follow every minute spent on the team’s mobile app, plus each highlight video watched or article read.

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