The meta keyword tag isn't used by modern browsers (more info). It's only used by competitors to see what keywords you are targeting 
As Kay mentioned just keep it natural, if you feel its light then maybe you need more relevant content.
Posts made by Axios_Systems
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RE: The Keyword density in a landing page is very low . by adding meta keyword tag can improve keyword density?posted in On-Page Optimization
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RE: Switching Google Analytics from Urchin to GAposted in Reporting & Analytics
Broken link - or is it just me?
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Switching Google Analytics from Urchin to GAposted in Reporting & Analytics
I want to finally make the switch from Urchin to GA in Analytics, but the Google support page is no longer working (I realize I'm late to this so they likely took it down/moved it to where I can't find it). I've been searching on Google but can't find a straightforward guide to changing that won't disrupt my data. Anyone have a link to a working guide, or can you provide some guidance?