How Often Should You Blog?

For small business blogs there are several opinions about daily blogging, and it's impossible to give one answer to the question "Should you blog every day or less frequent?"
If you look at some of the most successful blogs, you notice that they all do post something every single day, or at least every weekday, if they're blogging about business topics. And some of them blog even more than once a day and have evolved into being more "online magazines" or "news sites" than traditional blogs.
I can see two explanations to that:

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