It used to be that nasty retailers could intimidate a customer - or, at worst, limit the damage to (direct) word of mouth. Now, your obnoxious and stupid behavior can be broadcast around the world.

I made this point the other day, but this is a great example. The whole "Dell Hell" and Sony XCP things are also great examples. One dumb employee, or a set of stupid support policies, can just ruin your entire day.