The Twitter question for this week was:
Do you research keywords before writing a blog post or article?
@erichollebone: "We pull from an ever updating internal list of KW and ask the blogger to use 5–10 per post."
@RyanJones: "Sometimes...if it's a post I'm writing and trying to rank for something."
@ulstrup: "Absolutely (exceptions are requests from stubborn customers)." 
@nickihicks: "It's ironic you asked that – I'm doing it as we speak. But typically I don't do it for every single post."
@nickusborne: "Sometimes."
@craiglparker: "Depends on the importance and industry of the post. I would say I do research 60% of the time."
@johnnyt: "Yes; keyword research at least for what anchor text I use when including targeted links within a post as well."
@footinmouth: "That's a great idea, and obviously from my surprise, I don't at this time...but I think I'll try that next time!"
@JakePM: "No, do not use research tools. HOWEVER, keywords in title of post are extremely important for long term search results."
@aaranged: "Even if it's just a quick look on G. Insights for search, I always do KW research for blogs, articles."
My answer is typically no. I have rarely researched keywords for any newsletter article or column I've written as it seems like that would somehow make it contrived. That said, maybe I'll start doing it a bit for a few months and let you know how it goes!
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I'll try and do a quick search. A lot of times its just something simple.
For example if I'm writing an article on copywriting tips. A quick look at Wordtracker gives me a few gems that says "creative copywriting" is going to give me a little more juice. So I'll adjust my title and a few references in the article and I'll be on my way.
Nothing major, but it can give my article a slightly better chance to rank.