Facebook may have as many users as there are people in America, but not everyone is allowed on the site. In recent months, there have been multiple cases of people being banned from Facebook, or at the very least, restricted in how they can act on the social network. Here are a few notable examples:

1. Sex Offenders - Dozens of states have passed laws that require sex offenders to join an e-mail registry. This has made it easier for social networking sites like Facebook to eliminate accounts held by registered sex offenders. In New York alone, nearly 3,000 offenders have been kicked off of Facebook and more are expected to be, according to the Associated Press.

2. Judges - Not only are people who break the law restricted from using Facebook, but so are the people who enforce it. Recently, the Florida Judicial Ethics Advisory Committee decided that judges who use Facebook and other social networking sites should be prohibited from friending lawyers. The general thought is that by being friends on Facebook, it might send the impression that the lawyer is “in a special position to influence the judge.” Granted, these judges are still allowed to use the site, but what’s the point? How would you like to be banned from networking with your coworkers?

3. Dumb Bloggers – Last year, David Lat, the writer behind the blog Above the Law, discovered that his Facebook account had been canceled. He soon learned that he had been banned from Facebook for posting “parts of another user’s Facebook profile.” (The profile in question belonged to a "beauty queen-turned-law student" who kidnapped her ex-boyfriend.) Eventually, the decision was reversed, but apparently the experience of being cut off from his preferred social network was so traumatizing that he had to moan about it in the New York Observer.

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4. Iran – While protestors in Iran made news a few months back by tweeting their way to a revolution, it wasn’t until recently that Iranians could join Facebook. Earlier this year, Facebook updated its terms of use, prohibiting citizens in countries embargoed by the U.S. from using Facebook. (To be fair, the government in Iran banned Facebook first.) However, the social network has since clarified its terms, this time emphasizing that citizens of Iran and other embargoed countries are allowed to use Facebook, but prohibited from doing commercial business through the site.

5. Babies – Much to the chagrin of overzealous parents and one Time Magazine writer, Facebook practices a form of ageism, prohibiting anyone under 13 from joining the site. Unfortunately, it turns out that some parents like to create accounts for their young children and post baby pictures on them. If you’re one of those parents, you may have to lie about your kid’s age to get them in. Or else you could sign them up for Twoddler.

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