After I added the little 'Grunt!' buttons to my site, F. showed me this article, "The Web is a Customer Service medium". Quote:
You're down to the bedrock. A boolean or integer value is the digital equivalent of a grunt. You can't get any more basic than a like, or a thumbs-up, or a favorite.
You really can't have a thought on the internet without someone else having had it before (and your coworkers knowing about it).
The grunting functionality on this site is now fully functional and requires no login.