Chris Evans finally joined Instagram and proved it was worth the wait! The actor shared his first post on the social media platform to make a major announcement on Friday, revealing he'd accepted pal and fellow Marvel star Chris Pratt's #AllInChallenge and planned to assemble a prize fans will definitely love 3000 a virtual hangout with all six original "Avengers" Robert Downey Jr., Chris Hemsworth, Scarlett Johansson, Mark Ruffalo, Jeremy Renner and, of course, Evans!
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