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Hi All ! Just an update. I did ask John Mu about the question. Would updating disavow on a regular basis have a negative effect on site rankings. He Said No. The reason to share this video here is because, this subject is so hot and i was curious to know the answer. Hope this thread can answer queries of others ppl as well who were confused. You can see the answer to my question here http://www.youtube.com/watch?v=FYys6QWYbvo&t=41m25s But, as Robert and Pete said, and i do agree with both of them, that disavow should be used as a last resort, and its better to do a complete check of backlinks and then try to remove them first and use disavow as the last option, for the domains which can't be removed. watch?v=FYys6QWYbvo&t=41m25s

Thanks.. For your answers. @sebastian and @cmc-sd both...I agree its not right time now to publish authorship for e-commerce sites.. Might be later google comes with a ideal plan for e-commerce sites

To my knowledge there is no penalty associated with design elements being re-used across multiple sites. As long as the content is unique there shouldn't be an issue. I certainly wouldn't recommend making a duplicate E-commerce site that sells the same products, but that has nothing to do with the design elements The main concern in this case would be competing keywords, link building and SEO tactics in general.

The use of h1 h2 and so on do not have to be related to the title.  Because of CSS a h1, h2 and h3 can be re-sized and styled to appear as a regular link.  Google gives more juice to h1, h2 and h3 tags however so the SEO benefits would be good so long as the links are relative to the page content.  So how they are written is very important.

The two most important points expressed in this thread of comments are: There is a reason for 404s, don't 301 everything There is no reason to lose the value of someone linking to your page. If those 2 statements are true then you should create an individual error page, and then everytime you serve a 404 you should include canonical to that error page. That page should have useful content (explanation of page missing and where you could go), probably a search box, and links to the most valuable content on your site. This satisfies both points.