Google no longer seems to be using this as a signal. There's nothing to be gained by using this plugin. This plugin lets you tell Google News abo
This button on the right rail lets you compliment your own stories and keeps track of how many you have left this week.
This shows how you can give credit to other stories by clicking the red S button, next to WordPress's link buttons in the Visual Editor, to create a link to the other site's story both in your post and in your header.