how can i use it as a webcam ???????
http://www.dpreview.com/news/0701/070117... You can't it is a digital camera not a webcam.
Buy a USB logitech webcam for doing internet stuff. No. You can use it to take picture and then upload them but you cannot use that sony camera to broadcast images via the web. That camera needs to save the picture and/or movies first (internal to the camera) before it sends them out its usb port or video port. It cannot send images directly to those ports without saving them first. And saving them take too much time to support web camming. I have some experience with this as I write software for webcams. Unfortunately you can't use a digital camera as a webcam unless it specifically has webcam (or "USB cam") functionality. It's a pain... On the up-side, webcams are pretty cheap now so you could get a dedicated one? Though I don't necessarily recommend Logitech as suggested above...
If you're interested in the webcam software I mentioned, check out
http://www.nimisis.com/software.php | 