It wasn't. Just a forum.
And while WB can be a good source of information if you can filter past all the crap, in the very early days of the site most of thru hiking questions were answered by people who had not thru hiked. Neither of the 2 thru hiking mods had done a thru. A lot of just plain bad info was given out. The site is much improved now with the number of thru hikers that have joined and participate.