Instant screencasts for twitter. This application is a web-based screen recorder, thus you do not need to download anything. It should work for Windows and Mac operating systems. Just go to their site and click on record and you will be able to record what you do on your screen. Best of all, it plays on almost every operating system out there. No need to worry about codecs and what-not. Just click on record and once done, all you have to do is to upload to Twitter to share with your friends/fans. The service is provided free.