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Here’s an example.
This radio station received 161 comments on their “Guess the Most Bacteria Spot” promotion.
In the example above, 3% of 9050 is 272. With 161 entries, their SSM is 59%! Now that’s a successful promotion. You could use the number of views as an alternate SSM.
If you really want to be accurate, you can look at your post in Facebook and see how many people were reached, at the bottom left. Use this number to calculate your SSM.
With 56 comments and 11,405 fans, their RSSM is a measly 0.5%. However, using a 3% organic reach estimate, the SSM is a more respectable 16.4%.
To calculate the SSM on Twitter, you can get a good estimate of reach from the Impressions reported in Twitter advertising analytics.
If the OTE Sports giveaway tweet got 150 impressions, their SSM would be 23%. If you’re planning on running a promotion on Twitter or Facebook, you can use a tool like
For example, if you spent $100 and you got 25 entries, your CPE would be $4. Your overall success metric is therefore 25% RSSM at $4 CPE. Compare that to 20% RSSM at $0 CPE, or 30% RSSM at $3 CPE, and you can get a rough idea of which promotions are working better than others. If you’re really good (or lucky) you could have a successful promotion that went viral, resulting in a 150% RSSM at $0 CPE.