Nearly 30 percent of managers said they used Facebook to vet new hires, while 26 percent said they used LinkedIn, according to a survey by CareerBuilder, paidContent reported.

eMarketer Senior Analyst Debra Aho Williamson told paidContent that Facebook is a good way to see how job candidates conduct themselves out of the office. Meanwhile, LinkedIn is a good "online resume" source, she said.

Additionally, 45 percent of respondents said they check social media profiles of newly hired employees, more than double the 22 percent who said so in 2008, according to the study, which polled more than 2,600 hiring managers in June. An additional 11 percent said they plan to begin using social networking sites to screen possible new hires.

Of respondents who said they do online searches of candidates:

• 29 percent use Facebook
• 26 percent use LinkedIn
• 21 percent use MySpace
• 11 percent search blogs
• 7 percent follow the candidate on Twitter