There are alot of programs in the market which can be used to record your activities on pc and to share them with your friends, but most of them are either paid softwares or they dont work/fulfill your requirement. ScreenJelly records your screen activity with your voice so you can spread it via Twitter or email. Use it to quickly share cool apps or software tips, report a bug, or just show stuff you like. Only problem with this service is that it only record upto 3 minutes.

No need to install or download anything! Visit ScreenJelly