<p>Cambridge University researcher Aleksandr Kogan&nbsp;, the academic at the center of the Facebook data-misuse scandal. CBS News / 60 Minutes via AP</p>
<p>Cambridge University researcher Aleksandr Kogan&nbsp;, the academic at the center of the Facebook data-misuse scandal. CBS News / 60 Minutes via AP</p>

Facebook data scientist Kogan says information was too vague to use