One thing I did after being smashed with visitors from Facebook was building a feature switch were I can turn off the most intense functions of the site. It hav

One thing I did after being smashed with visitors from Facebook was building a feature switch were I can turn off the most intense functions of the site. It have worked well. Loadtesting helps to determinate this features is and how your site will react under load. Caching is probably the first step if you're not already doing that.