A new poll carried out by the Associated Press (AP) and CNBC found that social networking giant Facebook has some steep challenges to overcome as it moves ever closer to becoming a public company this week.  Facebook is expected to start trading on Friday.
The AP-CNBC survey of 1,004 Facebook users, conducted between May 3 and May 7, found that 57 percent of Facebook users don’t click on sponsored content or ads and another 26 percent said they rarely do. Facebook depends on advertizing for …