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When you get the game you can set up an account on The Sims 3 Web site. Now, this is important because the Web site is a portal to many different things. There’s a section called My Page which has various subsections. My Page lets you set up a Facebook- or MySpace-style social networking page. My Blog lets you blog about your Sims 3 experience. There are also sections that let you manage your friends list, send and receive messages, and keep track of things that you’ve tagged in the game that you like.
Read More over at IGN here