Some options off the top of my head:

> Google Alerts and pick from there, to do it manually.

> If you have specific source sites in mind, you could use iframes (though I would consider this "ugly".

> Facebook widgets are used in Wordpress to pull FB content over. Using that as the beginning of a search term, I came up with this:
https://wordpress.org/plugins/feed-pull/

> Look into "full content" rss feed plugins, which is likely what you want.

From what I've read in my quick checking just now, the variables are a bit tricky to figure out if it's new to you.