Wiki's are a very impressive form of technology. I think that if they are used right they can be very helpful although many times they are not used right. Websites like Wikipedia are a good place to start for research but you can't actually use it in papers or definite research because anyone has access to it and can edit it. When a website like that is so freely changeable the facts can get all mixed up and there for can be completely wrong. I have heard of a teacher who told their students not to use Wikipedia to study for a test that was coming up and he went in and changed the webpage so that if they used it everything would be wrong. The next day for the test most of the students did bad on the test because they relied solely on Wikipedia. I think that Wikipedia is relied on too much as fact when it can be changed by anyone at anytime.
As for having a place where colleagues can collaborate on a single article I think that wiki's could be a great thing to use. Although, there are also other avenues they could take such as google+. On Google plus there is a place that you can create and edit documents collaboratively also, the creator of the page simply has to share the document with the other colleagues and then they all