SEO secrets - Knowledgebase
Should I use commas between keywords?
It is often discussed whether or not to use commas between keywords. Most search engines will not care as they remove the commas before reading the keywords, but some search engines might still use the comma to find exact keyword and keyword phrase matches.
In any case, the META-keyword tag does not carry much weight in the overall ranking algorithm for any of the major search engines and you will never get penalized for either using or not using commas.
Some people use commas because it makes it easier to read in the raw code. This can be helpful if you want to edit the META-tags by hand at a later time.
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