The most common mistake, surprisingly, is that job seekers don't anticipate that hiring managers will perform an internet search to find out more about them. This oversight can result in two different problems: 1. negative information that comes to light; and, 2. positive information is available, but not found.

It is always prudent to consider the potential career consequences of our actions, but with an increasing amount of real-time and historical information available on the Web, the likelihood is now much greater that missteps will be discovered by potential employers, even many years after the fact.

Some sources of information are obvious: photo posting sites, forums, blogs, and social networking sites. But less obvious sources are just as important. Google, for example, keeps Web pages cached and available to searchers. So even if a page has been taken down, it will come up in a Google search and can be accessed by clicking on the “Cached” link in Google’s results. ZoomInfo.com permanently stores Web pages that mention individuals by name and can be retrieved from their cache at any time.

In addition to your name, employers will Google your phone number, email address, former employers, and anything else on your resume that might produce a “hit” when combined with your first or last name, city or state. Before you send out a resume, perform each of these searches so you know what potential problems await you.

There are sources other than Google that employers may check; the most intimidating, perhaps, is Lexis-Nexis, which can search and retrieve nearly every newspaper, magazine, radio or TV story from the last twenty years, or more. Though not as extensive as Lexis-Nexis, public and university libraries offer full text access for written and transmitted stories.

Finally, there are many ways in which “legal” records can be retrieved at little or no cost from online databases. If you have a corporation registered in your name, marriage, divorce, bankruptcy, tax delinquency, civil or criminal court proceeding, or any type of state professional license, the records are generally available. Even traffic and parking tickets can sometimes be retrieved.

Information that enhances your reputation will aid your job quest. Attention must be paid, though, to assuring the information will be found. A Google search may miss something if it is associated with a less common variation of your name. I consistently use “Michael G Smith” as my name online, since anything associated with “Mike Smith” or “Michael Smith” will be listed so far down in Google’s results they won’t be seen. It’s important to decide what your name is and then stick with that exact form. “Kate Smith” is not the same, in Google’s eyes, as “Kathleen Smith,” “Bill Board” is not the same as “William Board,” and “James R Towne” is not the same as “James Towne.”

Finally, sites where individuals create and edit their own records are of critical importance. You have no control over much of what comes up in a Google search, but the employer knows you alone control the information at sites such as Linkedin, Facebook, MySpace, Flickr and so on. Content you post can be a liability if it is inconsistent or potentially embarrassing—your resume and your Linkedin work history, for example, had better agree. On the plus side, if you anticipate that potential employers will view your profile, then you can emphasize your accomplishments and achievements in order to make a good impression.

You must decide what your purpose is in having a presence on these sites. Your profile on Linkedin—currently, the most important business networking site—should not feature activities that detract from your “day job,” as that will give the impression your focus is not on work. If you are a fundraising professional and have a political blog that is compatible with the outlook of the organization you work for, that’s fine. But if your profile emphasizes a personal business you operate on the side, a reasonable person will conclude you are stretched too thin and your attention is divided.