Luke Bryan is among the celebrities who have received letters from the Federal Trade Commission about their product endorsements on Instagram. "Billboard" reports, the FTC contacted 45 celebrities after receiving complaints from three advocacy groups who claim Instagram "has become a platform for disguised advertising directed towards young consumers." The letter sent to Bryan specifically mentioned a post in which he was at Cabela's holding a fishing rod. The caption read, "Which one should I get" and included the hashtag HFE. Bryan has a clothing line called HFE, named for his single "Huntin', Fishin' and Lovin' Every Day," that's sold at Cabela's.