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Sorry it took so long, but this feature is now implemented. You should be able to add YouTube videos as your avatar now. Look under edit details in your user control panel.
sorry for double posting but when i watch a youtube video then i want it as my avatar it loads fine but when i click play on my avatar it says the video is unavalible nvm it was just a a fluke that i got three videos in a row that did that
ill just use a video that i made