Half of advertising and marketing executives polled said they use Google or another search engine to learn more about a prospective hire, according to a survey by The Creative Group, a division of Robert Half International Inc. (NYSE: RHI). Of those who searched online, 14% said they decided not to hire someone based on what they found, while 84% said they didn't find information that made them decide not to hire someone.

Dave Willmer, executive director of The Creative Group, said hiring managers aren't just looking for red flags by checking search engines. "They're also seeking evidence that a potential staff member is invested in the profession, perhaps through participation in trade groups, or industry blogs or message boards," Willmer said.