...looks like a stoned girl with a webcam...
Actually, I think decreasing the quality of the image would make it more realistic. Looping a smile, a giggle, and a smirking peek at the webcam itself, on top of a background of a slightly messy room (something dorm-like) that doesn't need to change, set the faking lighting to look like a screen on her face, and set up a textbot like the one mentioned at "http://news.bbc.co.uk/1/hi/magazine/3503465.stm.
The Eliza Effect meets LonelyGirl15.
[edit: removed HTML. My first post here, sorry.]