Why YouTube keeping empty right side space?

youtube-empty-right-sidespace

Why YouTube keeping empty right side space? Best page for YouTube test labs http://www.youtube.com/testtube

Upstream Sites
Percent of total visits to youtube.com preceded by a visit to the upstream site.

8.45%facebook.com
8.09%google.com
3.37%yahoo.com
1.96%google.fr
1.66%live.com
1.40%wikipedia.org
1.28%msn.com
1.06%google.com.br
1.05%google.es
0.97%orkut.com.br
Downstream Sites
Percent of total visits to youtube.com followed by a visit to the downstream site.

9.44%facebook.com
8.33%google.com
3.25%yahoo.com
1.96%live.com
1.58%google.fr
1.11%wikipedia.org
1.09%orkut.com.br
1.06%google.com.br
1.00%msn.com
0.94%google.es

TestTube
Welcome to TestTube, our ideas incubator. This is where YouTube engineers and developers test out recipes and concoctions that aren’t quite fully baked and invite you to tell us how they’re coming along.

Your comments will help us improve and perfect the mixtures we’re working on. So jump in, play around, and send your feedback directly to the brains behind the scenes.

Comment Search
Discover videos by searching video comments.

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Insights for Audience
Discover what different audiences like doing on YouTube.

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CaptionTube
Add captions and subtitles to your YouTube videos with interactive caption editor.
* need Google account linked with YouTube account (Learn more)
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Video Annotations
Add interactive commentary to your videos! Link to other videos, add notes, and more.

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Warp
Visually browse YouTube videos in the Fullscreen player.

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Streams
Join Streams to chat with others who are watching the same video you are.

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HTML5 Video
Try an experimental version of the YouTube HTML5 video player.

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YouTube Music Discovery
Make playlists and discover new artists and music videos.

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Feather
View YouTube videos on a super-low latency page.

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