user: Character vector of screen names or user ids. See as_screenname() for more details.
device: Logical indicating whether to enable or disable device notifications from target user behaviors. Defaults to false.
retweets: Logical indicating whether to enable or disable retweets from target user behaviors. Defaults to false.
token: Use this to override authentication for a single API call. In many cases you are better off changing the default for all calls. See auth_as() for details.