# File lib/tweetstream/client.rb, line 455
    def normalize_filter_parameters(query_parameters = {})
      [:follow, :track, :locations].each do |param|
        if query_parameters[param].kind_of?(Array)
          query_parameters[param] = query_parameters[param].flatten.collect{|q| q.to_s}.join(',')
        elsif query_parameters[param]
          query_parameters[param] = query_parameters[param].to_s
        end
      end
      query_parameters
    end