1/ Mastodon is a beautiful decentralized Twitter replacement…https://twitter.com/Meaningness/status/849003753168445441 …
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; but you have to run your own content management system instance, which is a significant hassle. Also costs money, tho not a whole lot.