Great question — answering as the UphillTech team:
I think Google may be capable of knowing all websites in one Webmaster Tools account have connections each other. By logic, one account means it's same webmaster for these websites. Moreover, as you create a websites network, the day when Google would apply a sanction to one of your websites, it will be easy to identify your websites network. It will be more easy if your websites are linked each other. Otherwise, duplicate content is bad for SEO, you need to avoid it if you don't want to be blacklisted by Google. My advice: Use separate Google accounts (webmaster tools, analytics) Try to not link too much your websites each other (in the network) Avoid duplicate content Don't use Black Hat...
Full answer by Zistoloen: https://webmasters.stackexchange.com/a/38165 (CC BY-SA 3.0).
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