Sent to all four girls:
Show me your boobs. -A (assumed to have been sent by an impostor) (Read aloud, never shown on screen).
Mona played with dolls. I play with body parts. Game on, bitches. –A. (with alot of pictures of the girls near Ali's grave in Spencer's car) (Read aloud, never shown on screen).
Sent to Emily:
I bet you remember me.
Episode 2: Blood Is The New Black
Sent to Aria:
Daddy needs to know. Or I let the other one go. To the police. 'Night-night. – A
Sent to Emily:
DEAD GIRLS CANT SMILE (written on "Ali's" teeth)
Episode 4: Birds of a Feather
Sent to all four girls:
Imagine what I could do with fifty grand. – A
Sent to Hanna:
I'm everywhere, Hanna – A (sent with a photo of a car accident)
Episode 6: The Remains of the "A"
Sent to Spencer:
Hey Spence, I have one more surprise for you. Garrett isn't their killer. – A
Episode 7: Crazy
Sent to Hanna:
SEE HOW EASY IT IS FOR ME TO GET YOUR BLOOD? (with an "A" circled on the board)
Episode 8: Stolen Kisses
Sent to Spencer (Also for Emily and Aria):
Mona's almost gone. Hanna's next. – A
Episode 9: The Kahn Game
Sent to Hanna
The Apple Rose Grille at closing time. Go alone or Caleb pays. -A (Caleb pretending to be A)
Episode 10: What Lies Beneath
Sent to Hanna and Emily:
I'm saving you for later -A (spray-painted on wall)
Episode 12: The Lady Killer
Sent to Paige:
10PM Saturday Rosewood Cemetery [...]s hurt. – A (Paige's thumb blocks part of the message, but she later told the police it said if she didn't come alone, Emily would get hurt.)
Possibility:
10PM Saturday Rosewood Cemetery or Emily gets hurt. – A