explain yourself @TwitterSupportpic.twitter.com/J3ZD7bJRaR
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
I recently noticed I stopped seeing tweets from accounts I follow, turns out I had the quality filter turned on by default, which will basically hide tweets from accounts with QFD bans from your timeline.
Twitter may be over capacity or experiencing a momentary hiccup. Try again or visit Twitter Status for more information.