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Originally Posted by bigmax
SE rankings are a complex procedure. Doubt hidden links and the like are particularly penalizing. It's just too complex.
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Doubt no more, from Google itself
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Hidden text and links
Hiding text or links in your content can cause your site to be perceived as untrustworthy since it presents information to search engines differently than to visitors. Text (such as excessive keywords) can be hidden in several ways, including:
* Using white text on a white background
* Including text behind an image
* Using CSS to hide text
* Setting the font size to 0
If your site is perceived to contain hidden text and links that are deceptive in intent, your site may be removed from the Google index, and will not appear in search results pages.
Hidden text and links - Webmaster Help Center
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