Across the GetSocial Analytics product you'll often find the word Recirculation Depth.
Recirculation depth measures the length at which recirculation is happening. For more info on what recirculation means, visit "What is Recirculation?".
In the example above, the user visits an article through a social referral and then has 2 more page views to other articles. Therefore, the Recirculation Depth in this particular session is 3.