Daily deal site Groupon has seen ups and downs in the past couple of years, but the brand grew its active user base in the first half of 2014 by 19 percent and the company still
accounts for 59.1 percent of the U.S. daily deals market. Mobile is playing a larger role in the company's strategy, with mobile accounting for more than 40 percent of its transactions.
While the company has seen 92 million app downloads, email is still core to driving transactions.
Read the whole story at Marketing Land »