It's present everywhere and it's terrifyingpic.twitter.com/uqm1v1qUMW
You can add location information to your Tweets, such as your city or precise location, from the web and via third-party applications. You always have the option to delete your Tweet location history. Learn more
is it a certain 4-letter poster
Use the force!
This actually has a name: the Dunning-Kruger effect.
Yes, but in my experience most people are at least "unconsciously aware" of their incompetence. That's why they might for example over-estimate their spelling skills, but rarely enter spelling bees. Or they send private emails instead of opening publicly visible github issues.
Twitter may be over capacity or experiencing a momentary hiccup. Try again or visit Twitter Status for more information.