Our Captain America, Chris Evans debuted on Instagram two days ago for a special cause. In his first Instagram post, The Avengers: Endgame alum took up the All In Challenge after being nominated by his co-star Chris Pratt. The actor's Twitter posts were always a hit and Chris Evans just took it to another level with his first post on Instagram where he promised to let his lucky fans virtually unite with him and his friends from the Marvel Cinematic Universe.