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I've been coding for a while and it's just struck me, what's better to use in terms of SEO:
According to Matt Cutts are treated exactly the same. FYI, <i> and <em> are also treated the same.
Video where Matt Cutts says they have the same weight
John is right, but <b> denotes the way it should look like instead of the meaning like <strong>. The same with <i>, you are saying that text should be in italics but, with <em> you are making emphasis on that text.
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