I'd probably look at how Yoyo, Kleenex, Google, and Hoover were doing by comparison. The first to haven't been verbified, but they've become a general term for

I'd probably look at how Yoyo, Kleenex, Google, and Hoover were doing by comparison. The first to haven't been verbified, but they've become a general term for the category of products they represent. Google are still scared of Bing, but I think it has little, if anything, to do with its verbification. "Tweet" is also too different from "Twitter" to be warrant worries, I think.