Excerpt from:  Topic Cloud FAQ
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Does each blog channel have its own cloud?

Not by default, but it is possible.

The beauty of a topic cloud is that it covers the entire blogsite.

Typically, each blogsite has one topic cloud that encapsulates all blog posts and content items across the entire blogsite. This makes it possible to easily see all relevant information in the blogsite.

It is also possible to scale the cloud down to just a specific blog channel, but this requires a little additional configuration effort.

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