It is forbidden to contribute the work of others without explicit permission and notice. To avoid problems please:
But be aware of the fact that your work can easily be copied by others.
ToDo: License Issues. Who owns submitted content? What will happen to it in the future? Maybe adopt some existing License. cf. WikiPedia:Wikipedia:Copyrights , WikiPedia:GNU_Free_Documentation_License, http://www.opensource.org/licenses/