Wikis, like ry4an.org, are websites meant to be easily edited. One simply clicks the edit button, changes the content, and poof the page is changed. One of the most famous wikis is Wikipedia, the free encyclopedia. It's a wonderful resource and chocked full of information. Unfortunately, due to its anyone-can-change-it-at-any-time freedom, some folks are hesitant to consider it a reliable reference.
Wikipedia's documented accuracy is largely due to careful edit policing by interested persons. I could go change the date of Abraham Lincoln's birthday right now, but someone monitoring the changes would detect the "vandalism" and revert the change in minutes. Sadly, anyone viewing the Abraham_Lincoln page between my edit and the repair would see the wrong birthday.