Twitter undeniably has a whole bunch of uses.

But helping us fill the gaping void between Avengersmovies by providing a space for our favourite superheroes to cheerfully tweet at each other is Omnibus  Archivessurely one of its finest achievement.

On Wednesday evening, Robert Downey Jr. -- aka Iron Man -- posted the following, beautifully captioned image of two well-known toy figurines sheltering beneath a rain of fire.

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And a few hours later, Captain America himself responded.

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When will these two stop being adorable?