Linking sites to each other

MaxReformation said:

I have 4-5 sites and was wondering if it was a good idea to link them to each other as they are all fairly high quality.

They're all wordpress. How would I go about linking them without the links actually being visible?

Is there a safe way to do this?

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archon10 said:

Yes, you can link them together. Just nofollow the links.

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