SAN FRANCISCO, January 23 Be careful what you blog. It could get you fired. Peter Whitney said Wells Fargo dismissed him after co-workers discovered his online journal. Delta Airlines flight attendant Ellen Simonetti said she got the boot for hers. Even a staffer at Friendster, the social networking site in Mountain View, Calif., that encourages users to post detailed personal information about themselves online, said she was fired for her blog.

With blogging going mainstream and millions of Americans logging details of their everyday lives, including work, a growing number of people are getting into hot water for being too candid about their jobs.

Some workers have been fired for revealing confidential information. Others have been let go for openly griping about their co-workers or bosses, potentially poisoning their relationships with colleagues.

At least three dozen companies have reportedly fired or disciplined workers for the content of their blogs, according to a list that Simonetti, the former Delta employee, helped compile. And the list appears to be growing fast, as more and more people join the blogosphere.

“Firing people because of their blogs is a ridiculous trend,” said Simonetti, 29, who lives in Austin, Texas.

Simonetti, who writes under the nickname “Queen of the Sky,” said she was fired for posting “inappropriate” photos of herself in her online diary (queenofsky.journalspace.com).

Specifically, Simonetti posted several pictures of herself aboard a Delta plane in uniform, including one with a bit of her bra showing. Others showed her lying atop seats, showing off her legs or bending over to inspect a luggage bin. Simonetti said she was just goofing around. And she said co-workers took similar photos for fun.

“It was a joke, Simonetti said. “I don’t feel like I deserved to be fired.” Delta spokeswoman Benet Wilson confirmed that Simonetti no longer works for the airline, but said she could not discuss internal employee matters.

Simonetti said she never guessed her blog would get her into trouble, because she never mentioned her real name, city or the airline she worked for on the site. She didn’t even realize anyone at work was aware of the blog.

Other workers have been fired for making snarky comments about their bosses or co-workers online. Whitney, who worked for a brokerage owned by Wells Fargo, said he wrote about everything in his blog (gravityspike.blogspot.com), including gripes about work. For instance, the 27-year-old Seattle resident recalls complaining about having to chip in to buy a birthday card for a manager at work that he didn’t consider a friend. The manager wasn’t pleased when she later read the comments.

“She said her feelings had been hurt,” said Whitney, who was an administrative assistant for Wells Fargo’s Ragen MacKenzie unit.