def trackbacks(url, options={})
      results = handle_response(get("/trackbacks.json", :query => {:url => url}.merge(options)))
      results.list.each do |trackback|
        trackback.date = Time.at(trackback.date)
      end
      Topsy::Page.new(results,Topsy::Tweet)
    end
def trackbacks(url, options={})
      results = handle_response(get("/trackbacks.json", :query => {:url => url}.merge(options)))
      results.list.each do |trackback|
        trackback.date = Time.at(trackback.date)
      end
      Topsy::Page.new(results,Topsy::Tweet)
    end
Returns list of tweets (trackbacks) that mention the query URL, most recent first.

 @param [String] url URL string for the author.
 @param [Hash] options method options
 @option options [String] :contains Query string to filter results
 @option options [Boolean] :infonly filters trackbacks to influential only (default 0)
 @option options [Integer] :page page number of the result set. (default: 1, max: 10)
 @option options [Integer] :perpage limit number of results per page. (default: 10, max: 50)
 @return [Topsy::Page]