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that Yahoo! prefers meta keywords with commas, how true is this and what evidence backs it up?
I have been ranking fairly well in Yahoo, and was just wondering if it was worth the risk to change the meta to include commas.
But on-page factors still basically rule, so I would probably go ahead with making the change. (Oh, and I guess I did two years ago ;))
For anyone else who is wanting to know what is said here's a very important part:
'laptop computers' will count for 'laptop computers' and not 'laptop' or 'computers' separately. So doing it like that means that you're not going to be penalised for keyword spamming on the word 'computers'.
So the only way you could get penalized is by repeating 'computer laptop' more than once as a keyword phrase. It wouldn't help you anyways, so why do it?
As for telling competitors your keyword phrases, if they were smart enough to look at your meta tags for that, they would also be smart enough to use one of the other 10000 programs which tell keyword density of a page which would tell you even more than what the meta tags ever would about a site.
Besides, I believe Yahoo uses them more than 'just a little', as I have gotten some rankings by keywords mentioned only within the meta keywords, such as mispellings or other related words. Also, YPN uses them to help display their ads on your pages... which it definately needs at this point in time since it's usually way out there otherwise.