A site where you can have a secure, optionally private, ad-free wiki of your very own for a few dollars a month, or an insecure, ad-infested, public wiki for free. Neat-O.
S. Vahdati, N. Arndt, S. Auer, and C. Lange. Proceedings of 20th International Conference on Knowledge Engineering and Knowledge Management (EKAW'2016), 10024, Heidelberg, Springer Verlag, (November 2016)