@jashkenas @brendaneich in general, observers require a reference to one side, so two-way observers will need a reference to both
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
@jashkenas @brendaneich in general, observers require a reference to one side, so two-way observers will need a reference to both