As I've said before, digital images of current release movie posters are INSANELY popular on social media, especially Twitter.
Directors and stars commonly release/premiere these images via Twitter.
#1 social media king (although MP is nothin' special):
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Here, Robert Downey released a sorta-MP:
https://twitter.com/RobertDowneyJrObviously, many (perhaps most) of these likes/retweets are celebrity worship and for the underlying movie, but some are for the image, so it's a good thing for MPC World.
That's 1.4K comments, 16K retweets (which republishes them to ALL the followers of the retweeters), 71K likes
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Also on corporate accounts: