To comma or not to comma

What is the school of thought here when keywording your site?

I personally don't use a comma to seperate my keywords and I can't rememmber why or the logic behind it. Just a habit I seem to have fallen into..

When keywording I use the following
<meta name="keywords" content="keyword1 keyword2 keyword3">

Should I be using?
<meta name="keywords" content="keyword1 , keyword2 , keyword3">

Any thoughts on the pros and cons?

Hi Phil,

I've been reading some articles on this and come to the conclusion that it's a personal preference thing. As far as I can make out, the engines that still look at and use meta keywords read a comma as a space and so no one method weighs more than the other.

http://searchenginewatch.com/webmasters/article.php/2167931

http://www.grantasticdesigns.com/metatagtips.html

http://www.anisha.co.uk/Articles/metatags-keywords-commas.php

ATB

I believe the proper syntax is separated by a comma. How else would you have a multi-word keyword?

True - though my reasoning is coming back to me, but not seperate by a comma you are not fixing the order of your multi-word keyword?

For instance:
Batemans Bay Real Estate , Batemans Bay , Real Estate

Though by not seperating:
Batemans Bay Real Estate

I though that it would then not be limited to the multi-word as defined by you but it would find any instance of those words in a search term, in any order.

May start doing a bit more looking into it.

I wouldn't spend too much time on this since a lot of SEs ignore it or weight it low anyway.

I believe that the standard called for comma-seperated. That's good enough reason to do it.