Just so you know, just in case this episode might air at a different time in your local area, the proper episode to record (e.g. PVR, Tivo, etc.) is this one:
Lifetime (or Lifetime HD) "New, HD, S25/Ep35, (2012), (TV-14V), The use of social media to track criminals, pursue pedophiles and locate missing people is explored. Included: the murder of a professional billiards player; the slaying of a middle-school teacher. (Reality, 60 mins.), (V=Intense Violence)."
On Comcast, "Lifetime" is channel 38, while the HD version is 550. Obviously those channels will vary with your particular service (cable or satellite).