Here's my Wikipedia story:
Several years ago, while reading the entry for my Alma Mater, I decided to add my name to the list of notable alumni. (I'm not notable.)
About a year later, when I decided to google my name and was shocked to see myself at my University's website on a page they had enumerating their famous alumni! That's right--my college did its research on Wikipedia.
I decided to write my own wikipedia entry page--which stuck!--and among other references linked back to my University's page showing that I was a notable alumni. (I've written a number of books, so I was able to have a number of references that looked legit enough that my page wasn't deleted.)
Last year, while reading the glossy brochure for my University, there was my name on a page that talked about all the 'famous' people that had graduated there. My little Wikipedia vandalism had come full circle and became the truth!
I do not trust Wikipedia, and use this as an example to prove how bad an idea it is.