Groupon Cedes Share of Daily Deals to LivingSocial, Yipit Says - BusinessWeek

That would be the LivingSocial with an Amazon investment and partnership

Groupon Inc.’s share of online daily deals slipped to 48 percent in May from 52 percent the previous month, as rivals including LivingSocial.com closed in on its lead in the growing market for discounts offered on the Web.

LivingSocial claimed 24 percent of the market, up from 20 percent in April, according to website Yipit Inc., which studied online daily deals in 30 major North American cities. Yipit’s researchers estimate Chicago-based Groupon made $64.7 million in sales in May, more than double Washington-based LivingSocial’s $31.6 million.

Groupon Cedes Share of Daily Deals to LivingSocial, Yipit Says - BusinessWeek