Wikidot.com is a "wikifarm" the website lets you create your own wiki. It is free but they plaster their own adsense ads all over your wiki and do not allow you to put your own ads of any kind. If you pay them, then you don't get their ads and can place your own. They started out letting you have a free wiki and allowed you to place your own adsense ads and took a cut, then after they attracted enough users with wikis they smothered every wiki with their own ads. Like Geocities they made something wonderful and then ruined it.
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