Do you read The New York Times? Well, if you are signed in (membership is free of cost), then you will be able to see a "recommend" link like this one from a New York Times article. Seemingly, it is one of the article tools.
Are you already using it? If you need just a little bit to get tempted to start, here it is. New York Times has an application (facebook link) that you can link to your facebook profile.