Facebook is in testing with its new feature--Via--which will allow Facebook users to do their own version of re-tweeting. Aka. if somebody likes your Facebook post, they can click a little link and re-share it with their group. Of course, giving credit to you: the content creator.
This is great news for those of you who are using online media to provide quality, recent content. Because every time you do, you could be shared. Now on multiple social media networks.