Most buildings, I would guess, have a great number of teachers advising against using sites like Wikipedia and other collaborative networks for research; while others in the building see the power of making children responsible for finding (or bringing) information, choosing what is trustworthy, and citing their sources. This lack of consistency is due to the ignorance of some educators; for, they simply have not taken the time to experiment and see the power and necessity of the web.
The safety issue would also contribute to some educators staying away from the web. Safety should be a concern; and it is for this reason that it is important to teach today's students (and teachers) how to use the tools at their disposal effectively and not to abstain while at school... only to use them loosely while at home. Children need to know how to choose appropriate content, how to set up security options that protect their identity, and what "not" to put online (such as inappropriate pictures and video... and oftentimes their full names, where they live, and "what they are doing on Friday" for example).
The new literacies are of extreme importance. It is said that we are currently (at the middle school level) responsible for preparing children with the skills for jobs that don't yet exist. Seventy percent of the jobs that our students may be employed in don't exist today. So we must teach children to communicate, collaborate, and most importantly... to identify and solve problems. In order to do these things, we as educators, must use all of the tools at our disposal. We cannot limit ourselves to books, with copyright dates that are two years old... or even articles from magazines that were produced months earlier. We must teach them to use all of the information at their disposal.
Books, magazines, the web, blogs, forums, video conferencing, skype, etc. These are the tools of the future, all of which will be necessary for one to make contributions to the world that is coming our way... and more importantly, the world that our students will face in the coming years. We must adapt, otherwise we will be doing a grave disservice to the children with whom we work.

