Wikispaces is closing
Wikispaces is (was) one of the most popular tools for educators and it will shut down over the next months (classrooms will have until July 2018).
This is a sad moment for the world and a good one for me. I always tell people in education to never trust the cloud with long term projects. Learn how to to install and to manage a wiki yourself and it will not go away.
Of course, doing it yourself is costly. It will cost time and some money for a good hosting plan. I prefer that as opposed to selling away my soul and loosing everything at the end. Wikispaces did have a decent policy with respect to advertisements and that is maybe why they cannot raise money for fixing the code to include the mostly useless features that modern websites should have...