THE Internet never forgets.

Just ask the New York City teacher who recently divorced his wife of five years. Drop his name into Google, and his ex-wife appears in pictures of vacations and Christmas parties. “It’s difficult when you’re trying to date and your ex is still in the picture, so to speak,” said the teacher, who didn’t want to make matters worse by having his name in a newspaper.

The same goes for Bryan, an advertising executive in New York City. He is an accomplished online marketer and New York University professor, but search his name, and one of the first Web results is a press release from the United States attorney’s office. Eight years earlier, he was charged with wrongfully receiving 9/11 grant money. “Even after all these years,” those links remained, said Bryan, who paid a $2,000 fine.

And then there is the Philadelphia physiologist who became unwittingly linked to a consumer advocacy site, when it listed him as a graduate of a distance learning school that was shut down. “I felt totally victimized because there was nothing I could do,” said the physiologist, who spoke on the condition of anonymity because he did not want added attention. “My case load started to dry up.”

At first, some tried manipulating the Web results on their own, by doing things like manually deleting photos from Flickr, revising Facebook pages and asking bloggers to remove offending posts. But like a metastasized cancer, the incriminating data had embedded itself into the nether reaches of cyberspace, etched into archives, algorithms and a web of hyperlinks.