Wow that’s nice, Google don’t use keywords meta tag in web ranking. So I think this is a good thing right, cause like Matt Cutts explains, this technique was used for spam a lot. Don’t get me wrong, don’t think that if you use keywords meta tag you will do something wrong. No! It just don’t matter for Google when they will craw your site. So even if you use keywords meta tag, or you don’t at least Google (which I personally think it is the biggest Search Engine) won’t use that in web ranking.
Another useful post on this topic you can read on Yoast site. He has the same point of view as Matt Cutts regarding uses of keywords meta tag:
There is one question about SEO which seems to be coming up time and time again, so let me answer it now and be done with it. Meta Keywords are useless. No search engine uses them for any real rankings. That is why by default, there is no meta keywords input field in my WordPress SEO plugin and why I never use them. The fact that “other SEO plugins do have them” isn’t a good reason for me to enable them in my plugin by default.
Do Yahoo! and Bing use meta keywords?
In October of that same year, 2009, almost two years ago, at SMX East, Yahoo! announced they no longer use the meta keywords tag anymore either. This turned out to be not entirely true, as they do index them, but they won’t help you one bit.
Bing said at one point, in a guide about how to optimize your page:
“It was abused far too much and lost most of its cachet. But there’s no need to ignore the tag. Take advantage of all legitimate opportunities to score keyword credit, even when the payoff is relatively low.”
So basically they’re encouraging you to do fill it out, even though the “credit” will be admittedly very, very low. I say: don’t do it at all. Don’t waste your time. Instead of thinking about which keywords to put in that silly meta keywords tag for 5 minutes, think about your content for 5 minutes longer. Really. It’s worth it.