Enhanced distribution allows your blog’s public content to be included in the WordPress.com firehose.
This module is now enabled by default. If you would like to deactivate it or make sure that it is active, please visit Control Jetpack’s Modules on One Page for instructions.
The firehose is a stream of the public data (public posts, comments, etc.) that flow through WordPress.com (and Jetpack blogs that participate in Enhanced Distribution). The firehose is used by companies and people who are interested in public blog content. When these firehose users display content from your blog, they are required to link back to your blog.