Bill probably isn't as "social" as he could be, but when he does speak up on the web he usually does it at one of these places:
Facebook: Bill Chernega
LinkedIn: Bill Chernega
Google+: Bill Chernega
You can contact Bill directly by e-mailing him at firstname.lastname@example.org. To ensure that Bill receives the mail, please include the word "billchernega.com" in the subject line.