/*
   * Follows the specified user, returning true in case of success.
   * If error, returns false.
   */
  public boolean doFollow(long user) {

    try {
      twitter.friendsFollowers().createFriendship(user);
      return true;
    } catch (Exception ex) {
      System.err.println("[ERROR] Can't follow " + user);
      ex.printStackTrace();
      return false;
    }
  }