Board Thread:General Discussion/@comment-117234-20131005182450/@comment-7697305-20131005185418

As I understand it, what the "official" label on the Gamepedia wiki (which is run by Curse, I believe) means is that it is affiliated with Terraria Online, which is an official fansite. I don't think that label means anything more than that.

As for why there are three, that's a bit difficult to answer. This wiki was started first (07:37, April 24, 2011), but I hear it was pretty bad back then (rampant vandalism, inactive admins, etc.). I imagine that the Curse wiki was started due to dissatisfaction with the state of this wiki or even issues with Wikia itself, though I can't really know for sure. The Terraria Online community took a shine to that one (which may or may not be related to events here), and hence it was made official. (I have no idea where the IGN wiki comes into the equation.)

Regarding differences in policies: I'm pretty sure there are plenty. For instance, unlike on this wiki, videos are (or at least were) just straight-up not allowed on the official wiki.