Did Groupon's ads cause revenues to tank?

In one month, Groupon’s skyrocketing revenues suddenly tanked by 30 percent—and it just happened to be the month of the site’s widely hated Super Bowl ad, according to data compiled by TechCrunch. The blog cited calculations based on every deal posted to Groupon’s site over the past year. After strong growth in 2010, especially at year’s end and into 2011, monthly revenue abruptly fell from $88.9 million in January to $61.7 million in February. It’s not like Groupon had dropped off the radar.