Confirming that he's shooting Captain America: Civil War this weekend, Robert Downey Jr. has shared an interesting hashtag which might just give us an idea about how Marvel will promote the highly anticipated movie. Hit the jump to check out his behind the scenes tease...

When the Civil War comic book was released in 2006, Marvel promoted it with the "Whose Side Are You On?" marketing campaign as they encouraged fans to pick between Captain America and Iron Man. Everyone has been assuming that Tony Stark will be Captain America: Civil War's "villain" though, but could this movie split the opinions of Marvel fanboys? Perhaps so, if Robert Downey Jr.'s #PickASide hashtag is anything to go by! Regardless of its significance, who wants to bet that he's in Atlanta this weekend testing alongside those young actors up for the role of Spider-Man?