>>671 I did think it was a little odd for RDJ to tag Tom in a post without following him. He's followed now, though.

It seems to me that Marvel is doing more social media promo for Thor, and I'd bet they were the reason for Tom's Instagram debut. Mark Ruffalo and Chris Hemsworth have both been sharing behind the scenes videos and photos. Tom's first photo was of Loki. I think it's not so much that they're being supportive of Tom as that they're promoting his account for professional reasons - RDJ by poking fun, Ruffalo by sharing that little clip of the two of them that's been very popular on tumblr.