But you better hurry!
Activision's official Facebook group for Marvel: Ultimate Alliance has a special treat for anyone who joins. The first 1000 members of the group will have a chance to win a Nintendo Wii and a copy of Marvel: Ultimate Alliance for Wii. But don't delay, because the group is already up to hundreds of members and will likely pass 1000 within hours.
Facebook is a popular social networking site, similar to MySpace. It was originally available only to college students, then high school students, and now anyone can join. Most groups at Facebook are formed by individuals, but companies like Activision can also pay to set up official groups for promoting their products.
You can access the Marvel: Ultimate Alliance group at this link (free registration or sign-in required). Click "Join Group" on the right to be entered into the prize drawing.