[md224]

I think the key to understanding Arrington's perspective here is to look at this sentence:

"And I certainly don’t see people giving out their Google+ names on the cable news networks and other TV shows."

My guess is that Arrington isn't interested in numbers as much as he is in what technology has more fully permeated the public consciousness. The assumption here is that mass media is still an accurate reflection of whatever's dominating the cultural mainstream... Arrington sees celebrities on TV advertising themselves via twitter handles but never a G+ account, so to him, G+ is essentially a fringe product.