Why Brad? and Why not Gillian? I think David and Giliian handle the account.

Gillian? Really? Gillian doesn’t handle her own account and I’m pretty sure than being a full time working actress and a mother of three who always claim not to have any social media app on her phone, she has many other things to do than answering a bunch of David’s fans asking questions to his dog! 
The two of them cuddling in bed and laughing while tweeting on Brick’s account is cute, but don’t forget they’re adults, not two teens living in a Disney Channel movie 🙂