Twitter is an online social networking service and microblogging service that enables its users to send and read text-based messages of up to 140 characters, known as "tweets".

MaPa Microblogging Script
User friendly Microblogging and online community script that allows you to create your own microblogging website quickly and easily. Features: Easy to use admin control panel, private message system, friendly urls, SEO optimized templates, image upload, Google Adsense integration and more.
ReVou Twitter Clone
☆☆ Revou is a revolutionary PHP driven social network software that allows you to run your micro blogging site just like Twitter. Revou is fully customizable and feature pack including SMS integration, custom API and more ☆☆
Twitter Clone Script
Twitter Script is a revolutionary PHP software that allows you and run your own micro blogging site just like Twitter.