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Dean Pelton lets two designers test their new social networking application at Greendale, leading to a war among the students; Professor Hickey decides to go underground until the battle ends.
Jeff helps Duncan pursue Britta.
After Pierce Hawthorne's funeral, the gang retires to the study room. They are surprised with a communal polygraph test by Pierce's attorney to prove themselves innocent of his murder. They are individually quizzed in an effort to prove their involvement of the potential crime.