E-mail: Brad gets legitimate e-mail from real live humans daily, and he reads it all. Because responding takes time, he does not answer correspondence he feels require no reply while others he will sometimes answer briefly. He's not being a jerk; he's just trying not to take up hours of his day answering email.
Sometimes e-mails will slip through the cracks or get accidentally deleted because he is only human.
If you are really hoping for a response and it has been over a week since you sent your query, please feel free to send another.
That said, please remember he can only juggle so much.
Linkedin: Brad is easy to find and can be connected with professionally via Linkedin.
Facebook: For those who poke around long enough, I do have a Facebook account but it is not a good way to communicate with or follow my latest updates. If there is something serious you need to reach me for, e-mail is the best way to go.