So in Article writing you need to provide sentences for each keyword, include Anchor text, Url, and the content must be Unique everytime you post a new Article. But what about blog commenting/ Social bookmarks?. They don't have enough space so I was wondering how do you do it? Do you just post shorter sentences for each keyword and make them unique for each comment or do you just do: Keyword, keyword, keyword - isn't that duplicate content if you do it this way and comment alot? Also, there's no Anchor text? it doesn't matter?