code: public List<Post> tagged(String tag, Map<String, ?> options) {
          if (options == null) {
              options = Collections.emptyMap();
          }
          Map<String, Object> soptions = JumblrClient.safeOptionMap(options);
          soptions.put("api_key", apiKey);
          soptions.put("tag", tag);
          return requestBuilder.get("/tagged", soptions).getTaggedPosts();
      }
docs: Tagged posts
  @param tag the tag to search
  @param options the options for the call (or null)
  @return a list of posts