a social networking service and wiki hosting service (or wiki farm)
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Wikidot is a social networking service and wiki hosting service (or wiki farm) operated and owned by Wikidot Inc.. It's the world's third-largest wiki farm with over 1 million active users, hosting over 12 million pages. Wikidot serves both private and public sites.
Wikidot has export/backup tools--but they're imperfect; in particular, it's not possible to backup the community forums of a wiki.