While they were on the road, their home in Mesa, Ariz., was burglarized. Hyman has an online video business called IzzyVideo.com, with 2,000 followers on Twitter. He thinks his Twitter updates tipped the burglars off.

“My wife thinks it could be a random thing, but I just have my suspicions,” he said. “They didn’t take any of our normal consumer electronics.” They took his video editing equipment.

Most people wouldn’t leave a recording on a home answering machine telling callers they’re on vacation for a week, and most people wouldn’t let mail or newspapers pile up while they were away. But users of social media think nothing of posting real-time vacation photos on Facebook showing themselves on beaches hundreds of miles from home, or sending out automatic e-mail messages that say, “I’m out of the country for a week.”

“I’m amazed at how many people get on there and say they’re going on vacation,” said Lee Struble, head of security at Monroe Community College in Rochester, N.Y.

Struble, 53, is a member of Facebook with more than 200 friends, many of them classmates from high school and college who recently reconnected through the site. “Some of these people you haven’t seen in 20 or 30 years,” said Struble. “But they know where you live or can find out pretty easily, they can do a Google Maps search and can get directions to your house, and you’re telling them that you’re going to be gone.”

Struble is careful about his outgoing e-mail messages. “I just tell people I’m going to be out of the office; I don’t say I’m going to be out of town,” he said.

Despite the fact that so many people share their vacation plans via the Internet, most Americans don’t think private information is secure online. “We actually polled on that question, and the majority of people, teenagers and adults, think that a determined searcher can find them — no matter how careful they are with information,” said Lee Rainey, who has studied Internet behavior extensively as director of the Pew Internet and American Life project in Washington, D.C.

New communication technology has always brought with it new risks and rules, usually learned the hard way. When telegrams were a primary means of long-distance communication, correspondents struggled to craft messages that would convey meaning without revealing private business to the operator. Party line phones were often conduits of news and gossip. And Prince Charles showed the world painfully that mobile conversations could be intercepted when his pillow-talk call to Camilla Bowles was made public.

Facebook and Twitter are so relatively new that users may not consider all the risks. For Hyman, Twitter was a way to connect with fans of IzzyVideo.com, where he offers how-to videos on video production. His wife teaches scrapbooking through videos at Paperclipping.com. About half of the new episodes they release are free, but viewers pay to access their archives.

“The customers have never met me in person,” Hyman said. “Twitter is a way for them to get to know me. You do business with people you know. I’m a real person. I take my kids to the park. I go on vacation. I’m not just some company!”

He added: “I forgot that there’s an inherent danger in putting yourself out there.”

Detective Steven Berry of the Mesa Police Department, which is investigating the burglary at Hyman’s home, said: “You’ve got to be careful about what you put out there. You never know who’s reading it.”

Despite the potential risks, some social media fans say they have no qualms about sharing their whereabouts.

“I don’t worry about it,” said David McCauley of Boise, a social media consultant who posts a running update of his activities for his Facebook friends. McCauley also communicates constantly on Twitter, where anyone can sign up to read your posts.

“If somebody really wanted to rob me, they could rob me whether they’re Tweeting about it or not,” McCauley said. “Most people who want to follow you (on Twitter) are typically not thieves, or they’re not looking to take your stuff; they just want to follow you and understand you.”

McCauley even plans to offer a description, via Twitter, of a trip to adopt a child overseas.

“In the grand scheme of all the noise that’s out here on the Internet and in Facebook and Twitter, there’s so much going on that it would be hard for somebody to zero in on me, looking for me to be gone,” he said. “I’m just not worth that much.”

Anne Wallace Allen, The Associated Press

• Ctrl-N: Create a new playlist
• Ctrl-Up Arrow/Ctrl-Down Arrow: Raises and lowers the volume, respectively.
• Ctrl-Left Arrow/Ctrl-Right Arrow: Skip back a song and skip ahead a song, respectively.
• Ctrl-Shift-H: Takes you directly to the iTunes Store home page.
• Space Bar: Play/pause the current song. (In other words, hit Space once to pause the song, again to resume, and so on.)

Rick Broida, PCWorld

So you need to search by metadata–the extra information that defines the contents of a file. Specifically, you need a program that can matches songs with the same title and by the same artist (because Smash Mouth’s “I’m a Believer” is not a duplicate of the Monkees’ original.)

You’ll also have to remember that no list of duplicate songs generated by software will be perfect. A program may not realize that Beatles and The Beatles are the same group. Nor can it always differentiate between the original studio recording and the live concert version. (I’ve known Dead Heads with probably ten versions of “Brokedown Palace.”)

But the right program can give you reasonably accurate lists to work through. Here are three I can recommend:

iTunes: Well, no, I wouldn’t recommend you download and install iTunes just for this purpose, but if you’re already using it, you’ve got a pretty good search tool. Just select File • Show Duplicates. If you have the same song as an .mp3 and a .m4a, iTunes will list both, but it won’t find any .wma versions.

Lincoln Spector, PCWorld