How can I use an external USB webcam with my Macintosh that has a built-in iSight camera?
There is a limitation to the Flash plugin that will not allow you to use an external USB webcam on a Macintosh with a built in iSight camera (such as an iMac or Macbook). Downloading and installing free Camtwist application will allow you to utilize your external USB camera as well as use some pretty interesting effects. The application must be installed and always running before you launch you Connect session. Complete information on how to install and utilize the Camtwist application is available here through this video tutorial.