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
Why not both?
Why though?
While the studies on this are effectively personal experience (kinda unethical to test this in a controlled way), regarding punishment, people become conditioned, but regarding rewards there is no such observed behavior. Conditioning breaks the mechanism, so rewarding is best.
Twitter may be over capacity or experiencing a momentary hiccup. Try again or visit Twitter Status for more information.
