How do I remove notifications from Yahoo articles on Facebook?

[Lee]

Sometimes I like to read Yahoo articles about Kardashians or who wore the best dress just to scroll down to the comments - but my other Facebook friends won't see it like that, and I oftentimes get people coming up to me out of the internet world asking me why I click on those articles. So how do I remove these notifications that show what articles I have read from my Facebook? It does it automatically.

[...]

Make sure you are signed into Facebook and go to Yahoo news and click a random article. (doesn't matter since you will remove it later). There should be a bar at the top of the page, showing your Facebook friends and to the right your picture. On "Your activity" you can remove certain activities such as articles you have read in the past or you can turn everything off completely by turning "Social" off.