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By Keith Wagstaff

Monday night, SpaceX's Falcon 9 rocket made a historic vertical landing back on Earth at Cape Canaveral after sending satellites into orbit, leading company founder Elon Musk to celebrate on Twitter.

Plenty of other people on social media congratulated SpaceX on its accomplishment. That included Jeff Bezos, founder and CEO of Amazon, whose company Blue Origin also recently landed a rocket. "Welcome to the club!" Bezos tweeted.

That all seems perfectly innocent, except that Musk wasn't exactly full of congratulations when Blue Origin announced its feat back in November. His problem? Blue Origin's New Shepard rocket is meant only for suborbital flight.

The first stage of SpaceX's Falcon 9 rocket reached the same height, around 62 miles, that the New Shepard rocket did. But it's capable of flying much higher. Also, Falcon 9 must travel much faster than New Shepard (which is built for space tourism) to deliver cargo into space.

Are people on social media reading too much into a couple of tweets sent between billionaires? Probably, but that doesn't mean they aren't enjoying the public display.