In a tight job market, building and maintaining an online presence is critical to networking and job hunting. Done right, it can be an important tool for present and future networking and useful for potential employers trying to get a sense of who you are, your talents and your experience. Done wrong, it can easily take you out of the running for most positions.

Here are five mistakes online job hunters make:

1. Forgetting manners.

If you use Twitter or you write a blog, you should assume that hiring managers and recruiters will read your updates and your posts. A December 2009 study by Microsoft Corp. found that 79% of hiring managers and job recruiters review online information about job applicants before making a hiring decision. Of those, 70% said that they have rejected candidates based on information that they found online. Top reasons listed? Concerns about lifestyle, inappropriate comments, and unsuitable photos and videos.

"Everything is indexed and able to be searched," says Miriam Salpeter, an Atlanta-based job search and social media coach. "Even Facebook, which many people consider a more private network, can easily become a trap for job seekers who post things they would not want a prospective boss to see."

Don't be lulled into thinking your privacy settings are foolproof. "All it takes is one person sharing information you might not want shared, forwarding a post, or otherwise breaching a trust for the illusion of privacy in a closed network to be eliminated," says Ms. Salpeter, who recommends not posting anything illegal (even if it's a joke), criticism of a boss, coworker or client, information about an interviewer, or anything sexual or discriminatory. "Assume your future boss is reading everything you share online," she says.

2. Overkill.

Blanketing social media networks with half-done profiles accomplishes nothing except to annoy the exact people you want to impress: prospective employees trying to find out more about on you.

One online profile done well is far more effective than several unpolished and incomplete ones, says Sree Sreenivasan, dean of students at Columbia University Graduate School of Journalism. He made the decision early on to limit himself to three social-networking sites: Facebook, LinkedIn and Twitter. "There is just not enough time," he says. "Pick two or three, then cultivate a presence there."

Many people make the mistake of joining LinkedIn and other social media sites and then just letting their profiles sit publicly unfinished, says Krista Canfield, a LinkedIn spokesperson. "Just signing up for an account simply isn't enough," she says. "At a bare minimum, make sure you're connected to at least 35 people and make sure your profile is 100 percent complete. Members with complete profiles are 40 times more likely to receive opportunities through LinkedIn."

LinkedIn, Facebook, and Twitter are the three most popular social networking sites for human resources managers to use for recruiting, according to a survey released last month by JobVite, a maker of recruiting software.

[1] [2] 下一页