Ah! I’ve just visited the forum for answers on how many number of tags and/or categories combinations. Here is the answer: http://en.support.wordpress.com/posts/tags/
Five to 10 tags (or categories, or a combination of the two) is a good number to add to each of your posts. The more tags you use, the less likely it is that your post will be selected for inclusion in the global tag listings.
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