Wiki
A wiki is a user-editable webpage which is great in education for collaboration, brainstorming, event coordination and planning projects like filmmaking. Basically they are a very easy way to make simple websites either collaboratively or on your own. You can use them for doing revision notes with classes or putting arrangement documents up so that pupils can make notes if they want to go over something. Any updates or changes to a wiki can be viewed in a feed reader just like a blog, so that you can see straight away when a pupil adds a note without having to go back and check every page in the site regularly.
Your own class Wiki
If you would like to try using wikis in your class, a good place to start is Wikispaces, which is free for educational use and very easy to use. The controls look just like a word processor, with the usual bold and underline buttons.
The explanation Wikis in Plain English of how it works is very informative and never dull.
forums
A forum is similar to a wiki being a place where people with common interests or requirements, can 'post' information. Although a forums information is usually displayed chronologically and there is no opportunity to edit another users text.
Wikipedia
The most well known wiki is Wikipedia which is an online encyclopedia created and edited by the users. If you feel you have particular knowledge in a topic you can add information to a site or remove text you know to be incorrect. On first glance this seems to be open to abuse, but there are safeguards in place and you can always roll back to a previous version. Wikipedia has been found by the journal Nature to be almost as accurate as Encyclopedia Britannica, with the average Wikipedia entry containing about four inaccuracies while Britannica's entries have on average three. This means that it is quite a good website to suggest pupils use when researching a topic for a moving image activity.