# File lib/termtter/api.rb, line 28
      def switch_user(username = nil)
        highline = create_highline
        username = highline.ask('your twitter username: ') if username.nil? || username.empty?
        password = highline.ask('your twitter password: ') { |q| q.echo = false }
        @twitter = create_twitter(username, password)
      end