things like http://www.sequenceinc.com/fraudfiles/2011/10/groupon-ipo-investors-beware-the-unaudited-financial-statements/ http://www.sequenceinc.com/fraudfiles

things like http://www.sequenceinc.com/fraudfiles/2011/10/groupon-ipo-investors-beware-the-unaudited-financial-statements/ http://www.sequenceinc.com/fraudfiles/2011/10/groupon-ipo-in... or http://www.thinktrade.net/ipo-fraud.php http://www.thinktrade.net/ipo-fraud.php or http://www.bloomberg.com/news/articles/2013-09-20/groupon-loses-bid-to-dismiss-ipo-securities-fraud-lawsuit http://www.bloomberg.com/news/articles/2013-09-20/groupon-lo... or http://www.bloombergview.com/articles/2012-04-04/groupon-ipo-scandal-is-the-sleaze-that-s-legal http://www.bloombergview.com/articles/2012-04-04/groupon-ipo... (edit: we're talking about groupon the corporate entity, not the product(s) they offer.)