Chris Martin doesn't have to worry about his online reputation as much as some people. If you Google his name, you get pages and pages of results about the lead singer of the band Coldplay.
Other people aren't quite as lucky.
Thanks in part to technology like blogs, wikis and social networking Web sites, someone can say something about someone else and post it for the world to see. Online search engines make accessing this information a snap. And this can spell trouble for anyone whose livelihood depends on projecting a flawless image.