It is one thing to catch someone plagiarizing an already fake essay. In my opinion though, exposing the cheater on the Internet by name is a punishment with far more severe consequences, that does not exactly fit the crime. Furthermore, we're not even assured that the student managed to get a passing grade for his version of the paper. If he did, maybe his teacher was also part of the problem.
This type of insensitive public lynching is so reminiscent of primary school. Fortunately, we grow up, develop a conscience and learn to regret some of the stupid acts we took, just because we could, that still reverberate in others in present days.
Before blowing your horn, please make sure that you're actually righting a wrong and are not causing more damage than you're repairing.