lib/websockets.js
function (users, fn) {
    for (var i = 0; i < users.length; i++) {
      if (!this.sockets[users[i]] || !this.sockets[users[i]].user) continue;
      this.sockets[users[i]].emit(fn(this.sockets[users[i]].user));
    }
  }
function (users, fn) {
    for (var i = 0; i < users.length; i++) {
      if (!this.sockets[users[i]] || !this.sockets[users[i]].user) continue;
      this.sockets[users[i]].emit(fn(this.sockets[users[i]].user));
    }
  }
send a message to a number of users running callback to get args send([uid, uid, ...], callback)