In the episode "The Perfect Storm", Lucy Hale sings a cover of the song "Who Knows Where the Time Goes? The official soundtrack was released on February 15, 2011.The core cast of "Pretty Little Liars" (excluding Janel Parrish who portrays Mona Vanderwaal) at The Paley Center For Media's Paley Fest 2014 Honoring "Pretty Little Liars".

One year later, the estranged friends are reunited as they begin receiving messages from a mysterious villain named "A" who threatens and tortures them for the mistakes they have made before and after Alison was alive.

At first, they think it is Alison herself, but after her body is found, the girls realize that someone else is planning on ruining their lives.

It was the dominant number one of its time slot in Adults 18–49, and the number one show in female teens.

On January 10, 2011, ABC Family picked the show up for a second season that premiered on June 14, 2011.

A TV tie in of the second book "Flawless" featuring an altered Season 3 poster was released on December 28, 2010.

The theme song for Pretty Little Liars is "Secret" by The Pierces, which was suggested by one of the show's stars, Ashley Benson.

Pretty Little Liars is an American teen drama, mystery–thriller television series loosely based on the popular book series of the same title, written by Sara Shepard. After an initial order of 10 episodes, ABC Family ordered an additional 12 episodes for season one on June 28, 2010.

These episodes began airing on January 3, 2011 and ended on March 21, 2011.

In December 2009, The Futon Critic confirmed the casting of Ashley Benson as Hanna Marin and Shay Mitchell as Emily Fields, as well as the addition of Laura Leighton as Ashley Marin, Nia Peeples as Pam Fields, Roark Critchlow as Tom Marin, and Bianca Lawson as Maya.