Our son loves Legos. He loves building the sets, and then coming up with his own creations and playing with them. Lego has really been marketing their Lego Universe massively multiplayer online game, and have been including fliers with purchases from the Lego Store.
Of course, our son wanted to sign up. We don't feel comfortable with any of our kids playing online. We want to make sure that we know who they are communicating with, and with a MMOG, there is a level of anonymity that the game provides, and I am sure that people take advantage of it. (They do state that they will be moderating the online play experience to make sure that kids stay safe.)
We talked with him about our concerns, and he understands why we won't let him play this game. Maybe when he is older we will let him play online.