Rules for Communicating on the Web

For my graduate course this week, I have to develop a set of rules for communicating on the Web. Here are some of my thoughts about rules I will need:

Many of my students have developed informal communication habits through the constant use of instant messaging and text messaging. So, I will include a Web rule which requires that they spell out words completely. Abbreviations and acronyms such as BTW (by the way) should not be used. Students will be directed to write their own thoughts in complete sentences.
One of my major concerns is that they use respect for one another in their postings. Therefore, there will be a rule with regard to being polite and courteous to one another. In addition, they will be reminded to be understanding and patient with each other's mistakes. So that they do not procrastinate, I will require that they respond to each posting in a timely manner -- at least within one week.