From Darren Rowse at Pro Blogger who weighs the differences from the two platforms.
Blog are also great for more in depth posts. This post is a perfect illustration of this – when Yaro asked me his question on Twitter I had 140 characters to sum up a lot of different thoughts and experiences and ended up not really saying a lot whereas this post is able to explore the topic in depth.
While some people see the strengths of one and the weaknesses of the other as reason to choose between Blogging and Twitter – I’ve come to see the power of using both in tandem. The key is to know what you’re trying to achieve with your online presences and to understand what each medium can do to help you achieve this.
I agree with Rowse. There is value with both platforms. With Twitter, you have immediacy. With blogging, you can go into detail.
One question that has been brought up repeatedly is that some people have replaced blogging aggressively with twittering.

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