While we can't cover specifics, all thumbnails uploaded to YouTube must follow our Community Guidelines. Your best resource will be the Thumbnail policies section of our Help Center article: https://goo.gl/EXSfQJ . Hope this info helps.
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
While we can't cover specifics, all thumbnails uploaded to YouTube must follow our Community Guidelines. Your best resource will be the Thumbnail policies section of our Help Center article: https://goo.gl/EXSfQJ . Hope this info helps.