.. it's just the internet....

I disagree on two counts:
(1) I have read false informations galore in real books. Main difference: the author is easier to track.
(2) The internet will increasingly be the only way of publication for many types of information. So we should demand and expect that information published this way has to be correct as well.

But perhaps the only way to ensure that will be to take away anonymity. Which is how it is done in serious internet publications.

Wolfgang