Social Interaction Index (SSI) Explained

Learn how Social Interaction Index is calculated and how it works

Napoleon The Cat avatar
Written by Napoleon The Cat
Updated over a week ago

Let's talk about the Social Interaction Index, or SII for short. This nifty metric is available for Facebook Pages and shows you just how engaged your fans and other folks are with your content.

You can spot it in both Analytics (the "Summary" and "Engagement" tabs) and Reports (page in .pdf reports: "Social Interaction Index").

social interation index in napoleoncat

social interation index in napoleoncat

Unlike Engagement Rate, SII considers not only comments, reactions, and shares of posts from the page but also fan posts and their interactions.

So, how do we calculate SII? We've got a formula that assigns different weights to each type of interaction:

how to calculate SII
  • Reactions (likes etc.) have a weight of 1 since they're super common

  • Comments get a weight of 3 because they need more effort and can spark even more interaction

  • Shares score a weight of 9 as they boost the post's reach and show how involved your fans are

  • Fan posts on a page get a 0.1 weight because they don't always drive engagement or increase reach, but SII still counts the comments and reactions on these posts

To work out the SII, we multiply the interactions by their weights and then divide by the number of fans raised to the power of four. This way, you can compare engagement levels for pages with different-sized fan bases.

We know the formula might sound a bit complicated, but we did a bunch of econometric analyses to come up with the best formula that lets you compare engagement across different page sizes and takes into account the quality of engagement. 🤓

Oh, and for Facebook Pages, we also offer Engagement Rate (ER). If you're curious about the difference between ER and SII, < check out the article.

Happy analyzing!

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