Tyler Blackburn, who plays Caleb Rivers on ABC Family's PRETTY LITTLE LIARS and Brittany Curran, who guest stars as Phoebe on TWISTED, will participate in live chats via Twitter during the East Coast broadcasts of their series tomorrow, June 25th, starting at 8 p.m. ET/5 p.m. PT.Tyler Blackburn will be tweeting live during the East Coast broadcast of PRETTY LITTLE LIARS from 8-9 p.m. ET / 5-6 p.m. PT. Fans should tweet at his handle @tylerjblackburn and include the hashtag #PLLChat in their tweets to ask Tyler questions.