Цитата с форума DigitalPoint.

Вопрос:

Does google track who owns or runs websites? (...) For example, if you own two websites, similar topics but different content. You link site A to site B. (...)
Does google give the same value to this backlink compared to a backlink (everything else equal) from a website that is not owned by the same person / company?

Ответ:

it does not matter as long as all sites have different IP

Как раз актуально для меня сегодня. Но не в плане ссылок, а в плане сбора НЧ-трафика.