The One Stop Arts Social Reader is a Facebook app which allows you to see what articles on One Stop Arts have been read by your Facebook friends.
It's very simple to enable: just click on the "Enable Social Reading" button under the "Recently read" heading and follow the prompts. When you've done this, any article or review that you read on One Stop Arts will be posted to your Facebook timeline, and your Facebook friends will be able to see what you've been viewing. When you next go to an article on One Stop Arts (or simply refresh your page), you'll see a list of all the One Stop Arts articles that they have been reading.
If you want to be private for a while, that's fine too: simply click on the red/green traffic light button to switch the facility on or off: if your light is showing as red, nothing is now being sent to Facebook.