Apparently Google has stopped using Venafi (which forked) as a CT log and switched to... Symantec?!pic.twitter.com/jLI0Fx9zYT
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
Nice thing about CT is that it shouldn't matter who the operator is, since public auditing keeps them honest.
And since Google uses the TLS extension to deliver SCTs, it's easy for them to switch to a different log if necessary.
Twitter may be over capacity or experiencing a momentary hiccup. Try again or visit Twitter Status for more information.