I was at a networking event last night and was telling someone that I wanted to build something similar to Yelp. His first question was, “I wonder if there is a clone script for that?” What the hell is a clone script? It basically turns a CMS like Drupal or WordPress into a popular site. Want your own Twitter? Get a Twitter Script. Want your own Facebook? There are almost a dozen Facebook clone scripts. There are sites like clonescripts.com that host hundreds of sites. It seems like if there is a popular site, there is a clone script for it. And most in PHP.