docs.google.com shows up currently in the category "Personal Network Storage and Backup." Seems quite accurate to me.
Requires a valid subscription to see, but https://www.websense.com/sitelookup does allow administrators to test categories and report categorised URLs to the human review team. It is also available in the installed product, so admins don't even have to go out of their way.

After failing to download a database update for two weeks, the software will cease to function. Now that the subscription has been pulled, Yemen ISPs will have two weeks to find a different "solution" to their problem.

Is that 0.0003 U.S. cents or 0.000003 Verizon cents?

The problem is you are applying the sense of "knowing" to a program. The algorithm will most likely answer any and all questions, but with varying accuracy. Of course, a threshold for the expected accuracy before initiating a button press could be set, but it is still a very different concept. Programs are a way off from AI, but I would love to see how this project fairs.
If we knew more about the workings of a brain and could electronically replicate it, there would be less of a distinction in my mind.

Now cue the arguments that humans don't "know" anything either...

Under related stories:
"Firehose:Google online advertising acquisition blocked by Anonymous Coward"
Wow, either Google has suffered in the economic crash or we have super cowards!