Elon Musk made a jab at Facebook, linking the rampage at the Capitol to the social network. It's the latest insult in a years-long feud between Musk and Mark Zuckerberg.

Susan Walsh/AP; Erin Scott/Reuters

• There's no love lost between Elon Musk and Mark Zuckerberg.
• The billionaire tech CEOs — who helm Tesla and SpaceX, and Facebook, respectively — have been feuding since at least 2016, when a SpaceX rocket explosion destroyed a Facebook satellite.
• Since then, they've butted heads over everything from artificial intelligence to Facebook's data-collection practices.
• Most recently, Musk tied Facebook to the violent insurrection in Washington, DC, describing it as a "domino effect."

For over four years, Elon Musk and Mark Zuckerberg have clashed over everything from artificial intelligence to rockets.

The two moguls - who helm Tesla and SpaceX, and Facebook, respectively - haven't exactly kept their rivalry a secret. When a SpaceX rocket explosion destroyed a Facebook satellite in 2016, Zuckerberg issued a heated statement saying he was "deeply disappointed" about SpaceX's failure. And when Facebook became embroiled in the Cambridge Analytica scandal, Musk publicly deleted his companies' Facebook pages, tweeting that the company gives him "the willies."

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The two billionaires are among the richest people on the planet, placing them in an elite circle, even by Silicon Valley standards. Despite the fact that they both dabble in artificial intelligence and their companies have partnered in the past, it seems that there's no love lost between Musk and Zuckerberg.

Here's where their feud began and everything that's happened since.