Google Keyword Planner tool discrepancies.

Selected answers from the Dumb SEO Questions Facebook & G+ community.

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  Gregory Kristan: I have noticed such a large difference from the Google Keyword Planner tool and actual impressions (on Google AdWords / Google Webmaster Tools)
  
  Have you guys noticed that too?
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  Joseph Rogers: Keyword planner tool?
  
  I'm still trying to figure all that out. I have a tool that tracks various keywords of my choosing, but...
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  Gregory Kristan: +Joseph Rogers ;yeah, even if I see a keyword with N-A in search volume I still go for it. I see a lot of those keywords actually do have search volume, but the Keyword Planner claims the data is so low it is not available ;