hey, basically i want to know if its possible to hook up a webcam to a raspberry pi, and a 3g dongle, and stream audio and video live over the internet so people can go to a webpage and view the stream?
Hooking up the webcam has been done hundreds of times. Of course, the RPi camera is much simpler, much better and not expensive.
Setting up a server to broadcast the video has been done dozens of times too. A lot depends on what you want. There's a world of difference between a birdcam with a couple of simultaneous viewers and a popular video broadcast with hundreds of users.