How influential are influencers? FDA plots study to measure power of Instagram celebs

How influential are influencers? FDA plots study to measure power of Instagram celebs

Source: 
Fierce Pharma
snippet: 

Social media mavens do it for the gram, but the FDA wants know whether consumers give a care about paid endorsements. The agency is pitching two studies of four different kinds of influencers in advertising—celebrities, doctors, patients and online influencers—to determine just that.