Who is Parkaboy from Pattern Recognition and what is their importance?

Peter Gilbert (Parkaboy) lives in Chicago, and he is one of about twenty regulars to the site. He, Cayce and Darryl are trying to find the person or group responsible for the footage. Peter is instrumental in helping Cayce, and he serves as the spokesperson for those who lean towards Progressives in that they assume the footage is a group of fragments that are part of a work in progress and is something unfinished - still being created by the sender.