pkKumar - 1:30 pm on Jun 6, 2013 (gmt 0)
as mentioned i have used it for my product visibility with nofollow attribute, also the site which is affected has same type of header link for my other site, But that site has not been affected.
I would double check ANY actions you've ever taken (on-site or off-site) that are specific to keywords - really look hard to see if those words are used naturally
I agree to this actually, not an expert in link building, i usually follows what my successful competitors did for link building. And also in my niche its difficult for others to link to you.
you have very low backlinks, either low in number or low in quality or both