<http://schema.org/image>
<http://rack.2.mshcdn.com/media/ZgkyMDE0LzAxLzEzLzNiL2dyb3Vwb24uMGNmYWEuanBnCnAJdGh1bWIJMTIwMHg2MjcjCmUJanBn/6cc63547/155/groupon.jpg>
<http://mashable.com/2014/01/13/groupon-ideeli/>