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The New Jersey teacher is the second this year to be involved in a controversy over a post on Facebook. Experts say cases like this are multiplying.

Once again, a Facebook post has gotten a teacher into trouble.

The Paterson, N.J., school district suspended a first-grade teacher Friday to investigate charges from parents that she wrote on Facebook about feeling like a "warden" and referred to her students as future criminals, the Record newspaper reports.

"We are seeing more of these cases," says Francisco Negrón, general counsel of the National School Boards Association.

Whether or not a district has a specific social media policy, he says, "the question is one about teacher judgment." District officials will need to consider the details, but the types of comments alleged in this case "show not only bad judgment, but are also hurtful to students and simply inappropriate."

Paterson school board president Theodore Best told the Record: "You can't simply fire someone for what they have on a Facebook page; but if that spills over and affects the classroom, then you can take action."

In February, the suspension of Pennsylvania high school teacher Natalie Munroe for Facebook posts about unnamed students sparked widespread debate about what's appropriate when teachers use social media.

These cases are "emblematic of a very large social shift that's taking place in the age of social media ... [where] the boundary between work and home is not nearly as distinct as it used to be," says Lee Rainie, director of the Pew Internet & American Life Project.

When people used to complain about their jobs over the backyard fence it usually stayed between neighbors, but when such comments are placed on a social media page, people need to realize they probably have a much larger audience than they intend, he says. "It's a public act."

School board president Mr. Best told the Record that he received messages from local NAACP members and others worried about the teacher's comments.

The local teachers union told the Record that the suspended teacher will be provided with an attorney.