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Forum Moderators: martinibuster
In any case, if you use the metakeyword tag, I would make sure the keywords are actually on the page, not a long string of words found anywhere on the site.
I thought the reason was because their algorithm worked better without the comma.
I believe the thought behind omitting commas in the META Keywords tag is to maximize the keyword combinations that the list could match.
For example, if the tag reads:
<META Name="Keywords" Content="blue widgets, red widgets, green widgets">
Then the tag would be slightly less relevant for searches for the phrases "widgets red" and "widgets green", because those phrases were interrupted by commas in the META Keyword tag. If you were to omit the commas, however, the tag and the page would be considered slightly more relevant for those keyword phrases.
That's the rationale, at any case.