"Rails will sometimes silently ignore a nested transaction and simply reuse the other transaction."pic.twitter.com/vSCEXtFGuq
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
3/ ...as it's best attempt to Do The Right Thing with an underlying component that violates the contract.
4/ ...and apparently if you pass the call to the Rails transaction a special flag, it will stop doing that and do something else.
Twitter may be over capacity or experiencing a momentary hiccup. Try again or visit Twitter Status for more information.