Presently One of My Main Domain having 6 to 7 sub domains (which are ranking very well) but my main domain is not ranking well after the penguin update. When we analyzed we found following.
I have following Questions in my mind, please clarify me to move forward.
1. Linking to sub-domains (keyword specific) from the footer links / main navigation is it right strategy?
2. If page is placed in robots.txt, but adding "nofollow" attribute to the respective link in the page, will it be right idea?
For Ex: In the site navigation one URL placed in robots.txt, throughout the website respective link will present, so we have added "nofollow" attribute as well.Is it correct idea?
3. From the sub domains, One of the page placed Keyword specific links to Main Domain with keyword specific..is it right idea?
For Ex: XX.XYZ.com website, From "About Us" page linked to Main domain with keyword specific? WIll it be treated as Negative?