It was used as part of the rave music mix in the episode 'Cherubim & Seraphim'.
The location was Brocket Hall, Lemsford, near Welwyn Garden City, Hertfordshire.
According to their website, whedonesque is featured in the second episode. Julie Benz plays "Darla" in this episode, as well as in the pilot episode.
The episode of Glee that featured a song by Ke$ha was 'Blame it on the Alcohol'.
The episode is called The Substitute. Gwyneth Paltrow was featured in that episode.
The song was "One Step Closer". It was featured in the ER episode "On the Beach."
Raven's birthday is featured in the episode "Birthmark".
The Little Kicks
iThink they kissed
It varies from episode to episode. The first person will tend to be who the episode featured the most or whom the episode was centered around.
Frogger. Episode 174, "The Frogger."
This is Series 1, episode 4 in Amersham
murphy's luck, season 2, episode 16