<http://schema.org/description>
"Google's referrals 2.0 ads, also known as Pay Per Action or Cost Per Acquisition ads have gone offline for a 24-hour period over the weekend.  \n\n\nFirst reports actually came from a WebmasterWorld thre"^^<http://www.w3.org/2001/XMLSchema#string>
<https://www.seroundtable.com/archives/014389.html>