One of my favourite wiki platforms is Wikispaces which I use for my ePortfolio and facilitating collaborative projects such as the Virtual International Day of the Midwife. However, the problem with many wiki platforms is they run adverts, which is not desirable when you are using them for education purposes. But the only way to get rid of the adverts has been to pay for ad-free functions.
For some time, Wikispaces has provided ad-free wiki to K12 educators but not for higher education. But I have just heard via Steve Hargadon that Wikispaces is now providing ad-free wiki to higher education - this will save you 50$US per year. It will also allow you to set up private wiki.
I am really pleased that Wikispaces has done this because I think is so much easier to use, especially compared to the wiki inside BlackBoard which I am currently using with students and staff.
Image: 'Magic! between the trees'