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Frequent site updates don’t raise PageRank automatically.
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A high PageRank can’t guarantee high positions in search results.
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The DMOZ and the Yahoo! catalogues don’t raise PageRank automatically.
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.edu and .gov sites don’t raise PageRank automatically.
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Other pages may have higher PageRank than the front page.
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The Wikipedia site links don’t raise PageRank automatically.
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The links with the ‘nofollow’ attribute don’t affect PageRank.
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Effective inner links affect PageRank.
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Topical site links have even greater affection.
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The text used in a link can often be of greater importance than the PageRank of the linked page.
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Outgoing and incoming links to good topical sites are very useful for your PageRank.
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Several same links are considered as one.
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Site may be banned for the links to the banned sites.