“And Twitter, like all systems at scale, is constantly in some state of degradation. In fact Twitter has 15 years of experience being in a state of partial degradation. 15 years is a long time to optimize for high availability in the face of degradation. This system was literally built for this. “
Decline and Fall of a Billionaire's Twitter
https://www.linkedin.com/pulse/decline-fall-billionaires-twitter-casey-rosenthal