Fixed geo coordinate formatting issues.
Added logic to avoid exceptions for emojis and other invalid characters in URI strings. There isn't any guidance for how to translate invalid characters in the Twitter API, so the current fix is a compromise that allows the user to post characters that will be invalid. A more robust approach for this problem is for you to write code that checks input strings, such as Tweets, to make sure the characters are valid and apply some type of mitigation strategy depending on the requirements of your application.