Why do you think they became a registrar.
Couldn't they have just looked at the public who is info like anyone else? Or does being a registrar give you premission to "look behind the curtain" in the case of a private registration? I would assume yes, at least in cases where a registrar is investigating some complaint or claim of tranfer fraud, but does it also give them right to circumvent private registration for their normal business use? Assuming that they are doing so, I don't know that they are, I am just asking.
Ask Epik/Whypark site owners how all domains using those nameservers were deindexed.
I'm not familiar with that. So basically they had a lot of "cross-linking" between the parked domain pages all on the same few serers and they got deindexed? Are they still deindexed?
All links have value, even in built ones, how you do it is important.
Build minisites on the other names, and link them to your main name via ads, that will help direct new visitors to your main site.
Yep, that is what I am doing.
Don't bother about hosting them on different servers / class c IPs, that won't add value.
I was under the impression that (with all other things being equal) the google algorithm would assign more value to a link from a site on a different server? (or C Class)
A 'cheap' minisite from a cheap minisite provider is probably worth what you pay for it, don't expect too much from them, get someone who knows what they're doing and the traffic could increase exponentially.
I am the minisite provider, so yes, they are truly "cheap" looking:red: but the content is solid, which should be the most important thing (at least for Google, not sure about how users feel about an older looking site with better content vs. a new, shiny site with content that is not quite as good) and on-page SEO should be good AFIK. I will have to work more on the look of those sites...
This reminds me of another question, does the google algorithm in any way evaluate the "visual look" of the site? In other words, if everything is exactly the same, but one site looks like 1998 wants it back and the other one looks really cool (but everything is the same: content, PR, backlinks, social media, traffic, etc. etc. etc.) does the visually more appealing site have any edge?
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So it I have one site, for example, about "winter hats" and another on about "summer hats", I don't hurt either site by having links between the two, right?
And I may very well help both, even if both are on the same Google webmaster account?