I don';t think this is a good idea because it gets really confusing when people delete their own comments. Sometimes, you don';t even know what the comment was!Plus, YouTube is a place where people can share ideas and thoughts. People shouldn';t be allowed to remove their comments.
ps: For those sites that choose not to use webmaster tools to rate their keywords, may be the median could be used. That way, the companies will make sure to rate the keywords that are really relevant to them. Maria
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