Maybe he likes Google chat cause it comes up on his cell phone and the company Q&A doesn't ? You can verify it but asking on the company Q&A the n waiting 48 hours for an answer. Or if you're not a "pain in the butt" investor you can always call his cell number and ask him in person. If you do a simple Goog search, you'll find, unlike most pinkie CEO's, he advertises both his cell number and work number on Google. But if you decide to take the rout of calling him, I hope you will keep in mind, he does work and has a family.
I hope everyone will also keep in mind, if they decide to invade his family FB page, it is for family even though it is open for viewing by everyone.