or what the ads are being converted into and who monitors the conversion...<p>Now there <i>is</i> a room for ad agencies with a close relationship with the end product to link their pricing to conversion rate and eliminate the campaign buyer&#x27;s downside risk. But even if Facebook positively encouraged it, I don&#x27;t think a market for third parties to speculate on something as complex, heterogenous and generally low value as social ad campaigns exists.