[52-6F-62]

This gets pretty rowdy:

https://downdetector.com/status/twitter

[jfk13]

For a simpler view of things, there's also https://downforeveryoneorjustme.com

[zymhan]

I do love that this site still exists years later. I still use it regularly. It only took me like three years to remember the name right the first time.