Facebook was out of commission for several hours, allowing Bitcoin to briefly surpass the company's market capitalization today.
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The cause of the interruption is not clear.
The incident affected not only Facebook's main website, but also its secondary apps, WhatsApp and Instagram.
Facebook said it is "aware that some people are having problems accessing our apps and products" and that it is "working to get things back to normal as quickly as possible."
The interruption appears to have an internal cause. Facebook's domain name has apparently been deleted from the global IP routing tables, something that could only be done from within Facebook itself. Meanwhile, employees were reportedly barred from entering Facebook's main building, suggesting the company is keeping its systems under tight control.
The outage does not appear to be the result of external actors, as in the case of a DDOS attack, nor does it appear to be the result of external service failures, such as CDN/DNS outages.
While commentators have speculated about the possibility of internal sabotage or a system reconfiguration gone awry, the exact nature of the problem remains unclear.
Bitcoin soon surpasses Facebook
Today's shutdown has led Bitcoin to overtake Facebook in terms of market capitalization today. While Facebook sank to a valuation of $923 billion at one point, BTC's market capitalization briefly reached $929 billion.
This left Bitcoin as AssetDash's sixth largest asset, behind Apple, Microsoft, Saudi Aramco, Alphabet A (Google) and Amazon.
Bitcoin has already surpassed Facebook's market capitalization at least twice this year. These events were highlighted by Gemini's Cameron Winklevoss in January and Changpeng Zhao from Binance in April.
The rapidly changing prices mean that these assets changed positions several times throughout the day. As such, this position is unlikely to last for long.