This makes me question how I should link between my sites. Without publishing URLs, my sites sell a variety of consumer goods like books, cds, dvds, games etc etc. Each site has a different URL simply because they evolved that way over time.
At the moment each site links to the other sites at the top of each page (6 links in all).
So, given that each site has thousands of pages, they all have a fair few IBLs and equally external links from one another.
Given that they're all from the same IP address, is Google gonna catch on and penalise me? So far, it hasn't, but who knows....
My dilemma is: keep things as they are and hope for the best. Or, perhaps add "nofollow" to the links in the header? Or redirects instead? But of course then each site will suffer from a reduction of IBLs.
Soon I'm gonna launch the same sites overseas, and then the problem is amplified yet further.