If you're looking for a place to share your knowledge or discuss specific topics you may find an audience on Quora, where it offers creating a hosted blog.
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Pro Tags help promote your content
When you tag your blog post, it will show up in feeds of people following that topic.
Pro Community interested in learning
Quora has a built-in audience interested in learning new things.
Con No customization options
There is no way of making your Quora blog different from any other Quora blog. It is only an extension of your Quora profile.