Sarah Geis from Think About These Things has an awesome post that every debater must read.  It is a primer on how to argue Internet-style:

People have valued reasoned, fair disagreements and good listening skills for far too long. It is high time we dispense with those boring and outdated formalities! After all, why respect the laws of logic when you can enjoy the adventure of following your own passions? When you get the point, you can only either agree or disagree. How boring! On the other hand, when you miss the point, you open up a fallacy-filled wonderland where conversation and emotions are set free to frolic! If you wish to dispense with the authoritarian laws of logic (which care nothing about you!) and transcend the boundaries of social courtesy, then here are some suggestions for you to try on your entirely subjective journey. These primarily apply to written arguments, but can also apply to listening to a spoken argument.

My personal favorite:

12. Remember that no one has the right to criticize things you like. 
Decide right now that all criticisms of anything you like are immediately invalid. After all, we know that things and people that we like are perfect.

Thanks for a wonderful post, Sarah!  Keep up the good work.