Laurie Halse Anderson
Meg Cabot
P.C. Cast
Cassandra Clare
Suzanne Collins
Melissa de la Cruz
Sarah Dessen
Clare B. Dunkle
John Green
Ellen Hopkins
Stephenie Meyer
Walter Dean Myers
Christopher Paolini
James Patterson
Susan Beth Pfeffer
Rick Riordan
J. K. Rowling
Sara Shepard
Nicholas Sparks
Maggie Stiefvater
Kathryn Stockett
Scott Westerfeld
Jacqeline Woodson
Laurie Halse Anderson: @halseanderson
Meg Cabot: @megcabot
Sarah Dessen: @sarahdessen
John Green: @realjohngreen
Here are some links to find more of your favorites-
YA Authors On Twitter
Read Write Tweet
Children's and YA Authors
YA Author/Title List