News Summary: Groupon stock down amid worries

By The Associated Press

CHEAP STOCK: Groupon's stock plummeted Tuesday as analysts slashed targets and ratings on the online deals company.

THE SPARK: Groupon reported troubling signs, including its first-ever quarter-to-quarter decline in gross billings, a measure of how much money Groupon collects from customers.

TOO MUCH OF A GOOD THING?: Groupon blamed the weak economy in Europe and unfavorable currency-exchange rates, but analysts pointed to a more troubling possibility: online deals fatigue.