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Hello, I have a two larger established websites that achieve over 1000 unique views a day.  The sites have done well but we have always had problem with SEO.  The vast majority of traffic is from our social media accounts -- we rank low on the SERP - below competitive pages that have less updates and much lower traffic. When I set the sites up I misunderstood a number of key issues but with over 4500 posts and 600 pages it has takes a huge amount of time to change things. I have now realised another issue -- we did not use Anchor Text to link to provide internal links to our keywords on our site.   We are now adding them. My question is two fold: How many internal links should we add?  From what I read on Moz - 5 to 6 internal links should be the right number.  Comments? 2)  We have numerous posts ie over 4000 that go back over 4 years. Should I change them all at once or will this flag a spam issue with Google?  Believe me after years of problems I do not want another set back. Suggestions and advice would be welcome. Thanks

EDITED: To just focus on the issue at hand. I am trying to figure out the SEO rules instead of just working on the content.  Please bear with me.  I am adept technically.  I just do not know the rules of the SEO process or even some of the termology. So I’m trying to attack problems one at time. Today’s problem – **Duplicate Page Titles ** We evidently have thousands of Duplicate Page Titles. We are using Joomla 2.5 & Easyblog.  Our sitemap is automated from XML Sitemap Easyblog takes the title of the sites and uses it for a name of the summary pages.  We post 5 blog items per page and all the names are the same. http://www.OursiteName.com/?start=5               Page Title =  Site Name http://www.OursiteName.com/?start=10             Page Title =  Site Name A similar thing happens on the sorting by Author or Category etc etc.    Basically non-duplicate pages are looking like duplicates. What is the best practice / approach? Using the Robot.txt or XML Sitemap to tell Google not to crawl these pages? Writing a script or edit the Easyblog code to edit the 2000 duplicate Page Titles? Other thoughts?

I get different results when I'm log'd into my Google account associated with my website than if I'm not.  The same country is occurring. So how can I rely on the google results I'm seeing? For instance my site is page 1 with the improvements I made based on SEOMOZ if I'm log'd in.  Yet I'm not on the first 25 pages if I'm not logged in.