Search engines don't see all types of links, so when building links for SEO focus on those that make a difference, writes Gyutae Park. He provides examples of three links that are invisible to
engines, including Nofollow links created by Google, which allow webmasters to tell search engines when a link should not influence rankings. Park makes suggestions on tools to use, such as the SEO
for Firefox extension, which highlights nofollow links on the page. This makes them easy to find.
Other link types search engines cannot read and execute include Javascript
code. "You might find a dofollow link opportunity on a great high-authority page and think you landed on a goldmine," Park writes. "However, you could very easily be wrong. If the link is generated
via Javascript, it might as well be invisible."
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