This article summarizes how employers are more and more using the internet to screen applicants.
Believe it or not, it's the truth. Among US recruiters and HR professionals, "89% have used online data mining as part of the hiring process and most consider it appropriate to consider personal data." This number is huge!!! Even crazier, the article states, "70% have used data they've found online to reject job candidates"
If I were in charge of hiring people for a company, I would definitely use the internet to search the applicants. I think it is a great idea and it is obvious that the idea has caught on fast. I don't personally have anything on the internet that I should be ashamed of and it is that way for a reason. You never know who is looking and what opportunities could arise. If you do not approve of employers search you on the web, then I would recommend checking your security settings and more importantly, deleting some data.