By now, you've most likely noticed the many apps and Web services claiming to let you see who viewed your Facebook profile. Is your college ex checking up on you? Is someone from work scrolling through pictures of your beach vacation? Are your parents secretly peeking in on your private life? These apps promise the answers.
Unfortunately, they don't deliver. Not a single one of them.
You can be 100% certain that each and every app that says "See who views your profile!" or anything else like that is virus-laden junk. These apps would like you to cough up your Facebook password, or they might install the ability to spam your friends via your Facebook wall.
Again: Be extremely wary of any service or app that claims to show you who's been viewing your Facebook profile. This functionality violates Facebook's privacy rules. If you've fallen prey to a purported stalker app (or any other type of Facebook malware), be sure to check out Facebook's instructions for revoking app access to your account.
That said, there is a way to get clues and insights into who's been floating around your profile:
First, go to your fb profile, right-click on the page and choose View page source. When a page opens, press CTRL+F and a small window will appear. Then write InitialChat and press Enter.
When the code with numbers appear (as on the image above), copy the number that is closest to InitialChat without -2 and paste it in the URL bar as www.facebook.com/number-goes-here (www.facebook.com/12345678), press Enter and it will open the profile that viewed you last.
Try the other numbers in the order to see who else visited your profile.