So I’ve heard from Matt Cutts that if you have too many URLs on the same IP that are all linking to each other you can get penalized for trying to artificially boost your sites rankings (of course he didn’t specify exactly how many sites it takes to set off this penalty, but he did say a few is ok and won’t be penalized).
So based on that I have two questions:
1) if someone runs multiple related businesses, is it OK to have them on the same IP? Hypothetically speaking, say you own a company that sells tires and a company that sells wheels. So you’ve got a domain for each of those, one of which is already ranking very well for its keywords, but they’re on the same IP. Is it ok to link from one to the other, like on the tire store have a link to the wheel store and vice versa? I mean that makes sense, "hey, you bought some wheels! Don’t forget the tires! Link"
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