Why Did the Glee Kids Have to Learn of Their Termination Via Twitter?

How is it possible that the three leads on Glee found out they were "terminated" through social media? Isn't that what agents are for? Or reps from the show? _ Freddie B., via...

Source: http://feeds.eonline.com/~r/eonline/answer/~3/joyAY30ayJo/253143

Jordana Brewster Josie Maran Joss Stone Jules Asner Julia Stiles