In addition to the Zynga train wreck, Groupon (GRPN -7.7%) is falling due to a downgrade to...

In addition to the Zynga train wreck, Groupon (GRPN -7.7%) is falling due to a downgrade to Equalweight from Evercore's Ken Sena. Sena, who upgraded Groupon in April, is worried about both Groupon's performance - he thinks North American and international billings are "trending well below consensus" - and trustworthiness. He believes Groupon's Q1 beat was due to sales from Groupon Goods rather than improved daily deals performance, as the company claimed in May.