Nope, the trick is that he's skipping the "id=" part between the '?' and the use...

edu on June 26, 2012 | parent | context | favorite | on: We know what you're doing

Nope, the trick is that he's skipping the "id=" part between the '?' and the user ID, so the param is not being passed properly and thus the link is processed as just 'profile.php' without params. The link https://www.facebook.com/profile.php?id=yaddayadda would work propperly.