This episode featured an absolutely amazing storyline. I loved the idea of a serial killer stalking killers off of Facebook and such sites. Definitely a good reality check though, and I really wouldn't want this to happy to anybody in real life!
The episode was very well-executed, and I loved how there were many revelations right throughout the episode. They came to new conclusions right throughout the episode, with many new discoveries.
Definitely Season 5 continues to be great, and I hope the season finale keeps that trend going. This episode was just amazing, and I can't wait to see some more! Fantastic efftort, Criminal Minds, and keep it up!