Blog it now, regret it later?

Other times, the ease of posting unedited thoughts on the Web can be uglier, in part because of the speed with which the postings spread and multiply.

That's what happened at a middle school in Michigan last fall, when principals started receiving complaints from parents about some students' blog postings on Xanga. School officials couldn't do much about it. But when the students found out they were being monitored, a few posted threatening comments aimed at an assistant principal — and that led to some student suspensions.

"It was just a spiraling of downward emotions," says the school's principal. She spoke on the condition that she and her school not be identified, out of fear that being named would cause another Web frenzy.

"Kids just feed into to that and then more kids see it and so on," she says. "It's a negative power — but it's still a power."

Lenhart, the Pew researcher, likens blogs to the introduction of the telephone and the effect it had on teen's ability to communicate in the last century. She agrees that the Web has "increased the scope" of young people's communication even more.

"But at the root of it, we're talking about behaviors middle-schoolers have engaged in through the millennia," Lenhart says. "The march of technology forward is hard, and it has consequences that we don't always see."

She says parents would be wise to familiarize themselves with online blogging sites and to pose questions to their children such as, "What is appropriate?" and "What is fair?" to post.

It's also important to discuss the dangers of giving out personal information online.

One Pew survey released this spring found that 79 percent of teens agreed that people their age aren't careful enough when giving out information about themselves online. And increasingly, Lenhart says, this applies to blogs.

Caitlin Hoistion, a 15-year-old in Neptune, N.J., says she knows people who go as far as posting their cell phone numbers on their blogs _ something she doesn't do. She also often shows her postings to her mom, which has helped her mom give her some space and privacy online.

"That's not to say if I thought something dangerous was going on, I wouldn't ever spy on her," says her mother, Melissa Hoistion. "But she has given me no need to do so."

Many college students say they're learning to take precautions on their own.

John Malloy, a 19-year-old student at Centre College in Danville, Ky., has put a "friends lock" on his LiveJournal site so only people with a password he supplies can view it.

"A lot of times, my blog is among the first places I turn when I am angry or frustrated, and I am often quite unfair in my assessment of my situation in these posts," Malloy says. "Do I wish I hadn't posted? Of course. But I haven't actually gone as far to take posts down."

Instead he makes them "private" so only he can read them.

"I like to keep them to look back on," he says.

Meanwhile, Joseph Milliron, a 23-year-old college student in California, says he's become more cautious about posting photos online because people sometimes "borrow" them for their own sites.

It's just one trend that's made Milliron rethink what he includes in his blog.

"I know this very conspiracy theorist — but I wouldn't put it past a clever criminal to warehouse different databases and wait 20 years when all the Internet youth's indiscretions can be used for surreptitious purposes," says the senior at California State Polytechnic University, Pomona, who's been blogging for about three years.

Martin, the 23-year-old blogger in suburban Chicago, agrees that blogs can "provide just one more avenue for a person to embarrass him or herself."

"They also make it easier for people to tell everyone what a jerk you are," says Martin, who'll be heading to graduate school in Virginia this fall.

Still, she thinks blogging is worth it — to stay in touch with friends and to air her more creative work, including essays.

"I suppose in that way," she says, "I think of blogs as 'open mic nights' online."

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