?Extra?s? Tanika Ray spoke with Anthony Mackie at Universal Studios Hollywood, where he promoted his new film ?Avengers: Endgame.? Mackie also explained his reasoning for not joining Instagram, saying, ?I?m an adult. I?m old-school. I have Twitter. That?s what older cats do.? Anthony also revealed the big-time celebrity for whom he is often mistaken. Watch! ?Avengers: Endgame? is in theaters now.