The campaign supports gay, lesbian, bisexual and transgender young people and raises awareness about anti-gay bullying.
President Barack Obama and Secretary of State Hillary Clinton have recorded videos, so have celebrities and even some Google employees.
A Giants fan began an online petition to get the team on board. Meantime, Phoenix Suns president and CEO Rick Welts revealed, in a New York Times article, that he is gay.
Welts said he came forward because he wants to help break down one of the last significant social barriers in sports.