Much of the advice for your description tagalso holds true for your Meta keywords tag.
The keywords tag used to be very important when optimizing a website with all the search engines spidering and utilizing the information.
When it became obvious to the search engines that webmasters were stuffing their keywords tags with dozens of unrelated search terms, the search engines moved away from algorithms that used information collected from keywords tags.
We are now at the stage where, very few search engines use the keywords tags to any significant degree.
However, examine your traffic logs and you will be surprised at how many different search engines bring traffic to your website.
I’ll bet there are many small search engines, bringing traffic to your website, that you have never heard of before.
With many of these smaller search engines relying on older technology, and with it only taking a couple of minutes to add a keywords tag, it is worthwhile to at least look at the way you format your meta keywords tag.
