companies have long used criminal background checks, credit reports and even searches on google and linkedin to probe the previous lives of prospective employees. now, some companies are requiring job candidates to also pass a social media background check.a year-old start-up, social intelligence, scrapes the internet for everything prospective employees may have said or done online in the past seven years.then it assembles a dossier with examples of professional honors and charitable work, along with negative information that meets specific criteria: online evidence of racist remarks; references to drugs; sexually explicit photos, text messages or videos; flagrant displays of weapons or bombs and clearly identifiable violent activity.“we are not detectives,” said max drucker, chief executive of the company, which is based in santa barbara, calif. “all we assemble is what is publicly available on the internet today.”the federal trade commission, after initially raising concerns last fall about social intelligence’s business, determined the company is in compliance with the fair credit reporting act, but the service still alarms privacy advocates who say that it invites employers to look at information that may not be relevant to job performance.and what relevant unflattering information has led to job offers being withdrawn or not made? mr. drucker said that one prospective employee was found using craigslist to look for oxycontin. a woman posing naked in photos she put up on an image-sharing site didn’t get the job offer she was seeking at a hospital.other background reports have turned up examples of people making anti-semitic comments and racist remarks, he said. then there was the job applicant who belonged to a facebook group, “this is america. i shouldn’t have to press 1 for english.” this raises a question. “does that mean you don’t like people who don’t speak english?” asked mr. drucker rhetorically.mr. drucker said his goal was to conduct pre-employment screenings that would help companies meet their obligation to conduct fair and consistent hiring practices while protecting the privacy of job candidates.for example, he said the reports remove references to a person’s religion, race, marital status, disability and other information protected under federal employment laws, which companies are not supposed to ask about during interviews. also, job candidates must first consent to the background check, and they are notified of any adverse information found.he argues the search reduces the risk that employers may confuse the job candidate with someone else or expose the company to information that is not legally allowable or relevant. “googling someone is ridiculously unfair,” he said. “an employer could discriminate against someone inadvertently. or worse, they are exposing themselves to all kinds of allegations about discrimination.”marc s. rotenberg, president of the electronic privacy information center, based in washington, said that employers were entitled to gather information to make a determination about job-related expertise, but he expressed concern that “employers should not be judging what people in their private lives do away from the workplace.”less than a third of the data surfaced by mr. drucker’s firm comes from such major social platforms as facebook, twitter and myspace. he said much of the negative information about job candidates comes from deep web searches that find comments on blogs and posts on smaller social sites, like tumblr, the blogging site, as well as yahoo user groups, e-commerce sites, bulletin boards and even craigslist.then there are the photos and videos that people post — or find themselves tagged in — on facebook and youtube and other sharing sites like flickr, picasa, yfrog and photobucket.and it is photos and videos that seem to get most people in trouble. “sexually explicit photos and videos are beyond comprehension,” mr. drucker said. “we also see flagrant displays of weapons. and we see a lot of illegal activity. lots and lots of pictures of drug use.”he recalled one man who had 15 pages of photos showing himself with various guns, including an assault rifle. another man included pictures of himself standing in a greenhouse with large marijuana plants.