1. You have to get the content item ID from the Query String. Then you have access to the IContent object which has a property Comments that you can use.
itemId = (Guid)((IUrlRewriteData)Context.Items[Manager.Provider.ContentItemKey]).Data;
2. Each Blog post is an IContent item that has Comments property, so you can easily calculate and compare the count of the post and sort the top 10 posts. Please take a look at Content API
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