The case of internet communities is widely discussed in the context of the Web 2.0 idea. Cognitive, educational potential of communities is proved in Wikipedia, where groups of users in a dynamic way (discussion, co-operation) build knowledge resources. The quality of theirs works can be sometimes better than articles in the professionals encyclopedias. Despite all the problems connected with collective and freely edited knowledge, Wikipedia became an excellent place for starting a research.
But can online communities be helpful in the case of history preservation? Two projects started some time ago in Poland encourage internet users to collectively gather the historical materials and knowledge.