As one of Pixar's regular composers, look for some of his tweets to touch on his work with the studio.
Though Giacchino's account hasn't yet been officially Verified, he did receive a big Twitter welcome from Toy Story 3 director Lee Unkrich and others.
Giacchino currently has just over 5550 followers.
By the way, if you're still not following @The_Pixar_Blog, what are you waiting for?!