Elon Musk has mocked his billionaire rival Jeff Bezos yet again by posting a silver medal emoji as a response to one of the Amazon founder's tweets.
The cheeky message is thought to be alluding to Musk's status as the world's richest man.
According to the Bloomberg Billionaires Index, the SpaceX businessman's personal wealth has surged to $222 billion (£162.98 billion), with Bezos trailing his wake with 'just' $191.6 billion (£140 billion).
Musk never misses an opportunity to fire a catty jibe at his space race foe.
He overtook Bezos to become the world's richest person earlier this year. On Friday, Musk added $9 billion (£6.61 billion) to his wealth in just a single day after an agreement with investors saw SpaceX's value rocket above $100 billion (£73.41 billion).
The apparent taunt by Musk was in response to Bezos's post about an article from 1999.
The piece criticised Amazon and predicted the huge firm's fall. It branded Bezos as "just another middleman", adding that the idea that he has "pioneered a new business paradigm is silly".
Musk's response received more retweets and likes than Bezos's original tweet.
The rivals have swapped places as the world's richest people in recent months. The pair are also embroiled in what has been dubbed the 'billionaire space race'.
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Musk and Bezos have both advanced their interstellar ambitions this year.
The Amazon founder went into space about his Blue Origin company's New Shepard rocket in July.
Meanwhile, Musk has regularly mentioned his ambition to colonise Mars.
He reckons SpaceX could take humans to the red planet as soon as 2026 while he wants to start a colony there by 2050.
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The billionaire admitted the mission will be fraught with dangers, saying: "It's not for the faint of heart.
"Good chance you'll die, and it's going to be tough going. It'd better be pretty glorious if it works out."
In addition to their space rivalry, last year Amazon also ventured into the self-driving car business by buying a startup that would compete with Musk’s Tesla.
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