How does Auto Blog pull feeds?

With the Auto Blog plugin, does it take posts from the RSS feeds of other sites and then post the article onto your site?

So, imagine my site is A and I want (and have permission) to post content on my site from X, Y, and Z. Will it take the posts from X, Y, and Z and publish them into my site A's article feed?

Or is the functionality only for sites within my multisite network to pull articles solely from the main URL?