<<In addition to all the other stresses of a job search, do you really have to assume you’ll get Googled any time you apply for a job? Employment experts say yes.>>
Read the entire article at http://www.nydailynews.com/business/story/400977p-339405c.html.
While you can "mitigate" digital dirt, completely eliminating it may not be possible. Sites like waybackmachine.com keep archives of deleted information. Researching Internet archives for candidate information might not be as common as Googling candidates, however, these kinds of sites are available to employers (and others) to find old Internet information.
Whenever you are posting anywhere on the Internet, consider whether you would want that post to appear on the front page of a national publication. If not, think carefully before you post complaints and opinions that could turn into indelible digital dirt.