Linkedin 
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Linkedin is the largest business social media platform with its more than 770 million members.

Avarage CTR (click through rate) is around 0.25% while with precise targeting some can have as high as 0.522%.
With Sponsored Update average CTR is 0.75% while with Direct Sponsored Content it can go as high as 53%

As Linkedin says 4 of 5 the members are decision makers. While 28% of the 770+ million are in charge of budget equals 215.6 million people.