As of December 11, 2013, the Coupon Network will be closing.

From the Coupon Network Facebook Page:

Dear loyal Coupon Network fans,
December 11th, 2013 will be the last day to receive savings from CouponNetwork.com. Until then, we invite you to continue enjoying our fantastic offers!
Thank you for your support and appreciation over the last few years! It has been a pleasure helping you save on your favorite brands.
Sincerely,
The Coupon Network team