Wikia has an "alliance" program that allows wikis to join different groups. There are three groupings: Fantasy Alliance, SciFi Alliance, and Heroes Alliance. Here's a blurb about the benefits of joining:
"Choose an Alliance and your wiki will get updates about exclusive content (think beta codes, star interviews, giveaways, etc.) from member communities. Communities that participate will receive the badge on their community, proudly showing their alliance and giving first-access to this extra content. Plus, your community will get promoted on the hub to which it belongs, on Wikia’s Twitter and Facebook accounts, and you will be listed as member in the links below for all the world to see."
You can read more here. What do you guys think? …Read more >