Some users may wish to limit the internet except for services like Spotify. Spotify is not listed as a "Popular Sites" because it may conflict with other limits that have been set. Bellow are the exceptions needed to allow Spotify to work if the rest of the internet is blocked.
Popular Sites: Google* and Facebook**
*Google is required to log in because Spotify uses Google captcha.
**Facebook is required if you use the "Login with Facebook" feature.