I guess at the end of the day, anything that increases your online presence and visibility is a good thing in the current job market, although some may argue that the relevance of your blog topic is an important factor here. Obviously if you are yammering on about kittens, fruit juice, and gardening - it may not have much to do with your technological prowess. However, that being said, it WILL showcase your communication skills, your interests, and your passion for what you love/do/both.
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