Robert Downey Jr. And Mark Ruffalo Are Adorable On The 'Avengers: Age Of Ultron' Set

Filming for the Avengers sequel is fully underway now, and that means a lot of things: Looks at the costumes for Scarlet Witch and Quicksilver, speculation on how Guardians of the Galaxy and Age Of Ultron will affect Avengers 3, the list goes on. Mostly what it means, though, is that Robert Downey Jr. and Mark Ruffalo are being real damn cute on the set. And they're documenting it for all of us — for which we should be eternally grateful.

Though we didn't know until this afternoon that Ruffalo has joined the denizens of Tumblr, we have to say we're pretty happy that he did: Tumblr could always use more middle-aged dads spicing up the place with nonsense airport pictures.

Apparently the first thing these two (delightful) fools did upon touching down on the Age Of Ultron set was team up and decide to make our day. And/or their PR team gave them a crash course in how to kill fanpeople through social media. Either way it's working, because you can sense their excitement to be back at the Marvel grind through every twitpic, tumblr post, and tweet. And we wouldn't have it any other way when it comes to our favorite sciencebros.

And social media science they do indeed do:

Those adorable motherf***ers.

Images: Instagram, Imgfave, Know Your Meme