docs: public void getStreamsByUsername(String username, int pageNumber, int itemsPerPage, final KickflipCallback cb) {
          if (!assertActiveUserAvailable(cb)) return;
          GenericData data = new GenericData();
          addPaginationData(pageNumber, itemsPerPage, data);
          data.put("uuid", getActiveUser().getUUID());
          data.put("username", username);
          post(SEARCH_USER, new UrlEncodedContent(data), StreamList.class, cb);
      }