Orkut has a little spying feature called “profile visits” that automatically shows a list of people who have recently viewed your profile page on Orkut. The person may or may not be your Orkut friend.
What’s interesting about the Orkut spy camera is that it can only work both ways – so if you are interested in knowing about people who are checking your Orkut profile, you must also show them your visits to their profiles.
You can enable / disable Orkut profile visits through the Privacy option under Settings.
LinkedIn too provides a “Who Viewed My Profile” feature but there you get the option to know about people who viewed your profile without disclosing your visits.