here are other social networks that do let you see who's viewed your profile, mainly LinkedIn and its "Who's Viewed Your Profile" feature.
Regular users can see a recent list of who has been spying on you, along with some basic analytics, while paid users can see up to 90 days worth of viewers, as well as more detailed analytics. It's great for seeing potential job interest and company prospects.
And what's better than finding a hot girl that has a great job? Finding one that viewed your profile. So, why doesn't Facebook jump on board? How great would it be to know when a girl you just friended viewed your profile and photos? It would be pretty clutch.
While there isn't a built-in feature to see who exactly has checked you out, you still might be able to get some information on how often your Facebook friends are viewing your profile.