Email, Wikipaedia, Google, and Googlemaps are the REVELATIONS of the last 30 years.
I know many people resisted email... and still do... and go on and on about how it lowers standards of writing etc. And these people want to live in the dark ages, before electricity.
But I will defend the wiki. There is nothing MORE VALUABLE in education than total immersion. And wiki lets you do just that: go to a new topic or subject, and in minutes, you get an angle.
It's up to the reader to then VERIFY what has been read... just in the same way that you need to also challenge, investigate, research, think for yourself, about nearly any "fact" that we get through modern media... be it chat, gossip, news channels, newspapers, advertising, films, or wiki.
IT IS THE TEACHERS JOB to educate the pupils HOW to use the wiki effectively. (Indeed how to think critically about politics and spin too). The teachers are only MOANING because they are TOO LAZY to write new assignments and are just regurgitating the same old same old which IS AVAILABLE for instant access at wiki, and in 99.9% of the cases, HAS MORE KNOWLEDGE than the teacher themselves.
My moto "JUST SAY NO TO LAZY TEACHERS"