The Facebook app on iOS only let’s you save low quality photos 
Facebook should be able to notice I'm uploading a lower resolution photo of one I already posted and offer to upgrade it
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
Facebook should be able to notice I'm uploading a lower resolution photo of one I already posted and offer to upgrade it