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
Yes. I don't think it is unpacked. However, I am now being informed I don't actually need to be able to search this site anyway.
I am on the web but it won't let me search without this extension. However, I can find the DOI somewhere else & go from there.
Twitter may be over capacity or experiencing a momentary hiccup. Try again or visit Twitter Status for more information.