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I suspect she just created a funny little video of her staring at the camera, and when she found that people started watching it, she honed the process.
The last of the videos is actually very different. It's a response to a Kikkoman Soy Sauce advert.
http://ctu.spotlightmobile.com/get/yky/kikkomaso-e.swf
A very strange little animated short promoting Soy Sauce. It's actually pretty funny.