deals, e-commerce, social media, social networks, grouponGroupon reported a $0.12 adjusted loss per share today, missing analyst expectations and sending its stock tumbling after hours.

Although the Chicago-based company narrowed its operating loss relative to the last quarter of 2011, but its loss attributable to shareholders increased due to stock-based compensation and acquisition-related expenses of $26.6 million.

In a bright spot, Groupon reported record billings of $1.5 billion in the quarter, up by nearly a quarter over the same period in the previous year.

“Record billings growth this quarter is a clear signal that customers love Groupons. We will continue to invest in growth through 2013 as we see new opportunities to give our customers what they want,” said CEO Andrew Mason.