My theory of how the protagonist can extract information from the cell phones of dead people: He searches through their photos and such and checks the time the photo was taken. Possibly Anna just happened to be passing through the camera's point of view at the time. For the bulletein boards I can imagine it to be like "She'd be kicking and screaming if I had to take her there, so she can't possibly be over there."
 "Continuity"){kind=icon}
 "Bureau of Steam Engineering"){kind=icon}
 "The Final Death Wish"){kind=icon}
 "Zombies Took My Daughter!"){kind=icon}
 "Platform Racing 2"){kind=icon}
 "You Have To Burn The Rope"){kind=icon}
 "Peaceful Chatter"){kind=icon}
 "Kongregate Chat"){kind=icon}