We’ve heard and seen evidence that internal anchor text over-optimization (sorry, Jill, but this has really become a generally recognizable term) can result in Google penalty. Rand Fishkin, for example mentioned this issue in PRO tips as well as on the blog.

Still, while we are pretty sure, this penalty does exist, we don’t know how many internal keyword-rich links are actually too many.

Another great WebmasterWorld thread shares some results of experiments regarding this issue and while you are free to argue the overall accuracy of such tests, I thought it should definitely be brought to discussion here. (more…)