Acxiom’s stock fell 30% from recent high after Facebook announced it was terminating use of third party data aggregators. Zuckerberg makes lots of promises that never come true and Acxiom seems to think this is just like  other empty promises from Zuckerberg:

“We’ve seen some signs that Facebook is reconsidering the initial policy they issued last week on data imports in light of advertiser concerns that will have an economic impact,” Howe wrote in a message titled “A Call to Advertisers – Make Your Voice Heard.” “There are many talented and smart people at Facebook. And if they take action on this feedback, it would be a smart move for them and good news for the industry.”

Source: Acxiom CEO: ‘Signs’ That Facebook May Reverse Data Import Policy | AdExchanger