...hed a a wry post on AdAge.com suggesting that Groupon had clearly jumped the shark because the deal the company was offering that day in its own backyard was for 250 $20 nosebleed seats at a NKOTBSB (New Kids On The Block/Backstreet Boys) nostalgia-tour concert at Allstate Arena in Rosemont, Ill. To fill those 250 seats, Groupon blasted hundreds of thousands of its Chicagoland subscribers with an irrelevant offer.

Basica...