I did a quick site:mysite.com check on google, and it seems that several of my pages with totally unique content are being listed as "supplemental". Upon clicking the "similar pages" link, it appears that google thinks that other sites I own (that share a similar "template", but have totally different content) are related. They all have different IPs, too. For example, it is like google thinking a site selling baby products is related to a site selling skateboards. Why on earth does google think these are related? If anyone with any ideas can help out, I can PM you the URL. Thanks.
Just make sure you get deeplinks to pages in your site. At some point the pages will move out of the supplemental index and into the 'real' one.
That is only part of the problem though - I want to know why google thinks that clearly non-related sites are related. It must be using more than just a content match type algorithm, which is worrying.
If the only thing connecting them is you being the owner, google is clearly using that information. If they cross-link, that would be the source of the connection. Still, I'm not sure it can hurt your site that google knows the two are connected (unless you are doing something illegal here). When they get relevant inlinks (each their own), the issue should still disappear. If they are new, they need a bit of time as well.
The sites are on the same server, but do not share an IP address, and how could google know that I own all the sites - they could be client sites for all google knows. The whois info is private for all of them (and no, nothing illegal or even remotely dodgy!) I'm betting that it is due to the linking between them - probably more inbound links from different sources will help.
Matt Cutts from PubCOn Google bought a domain register a while ago... they CAN SEE YOU. So can Yahoo (also from PubCOn ) Mere goegraphically diverse Class C IPs are no longer as good as before :0) More Matt Cutts site reviews
absolutely, it is the linking between them. that is your answer. as for supps, get some links to those pages.
I have an old client who has about 20-30 websites and he insisted on crosslinking all of them, essentially giving run of site links on every site to every other site, all on the same server and same ip they have been ranking fine for years now I think you need some links from page with good pr, maybe sites that related to your site, but i am up in the air on that one, will know in a few weeks