TwtQpon

Twitter coupons: Users must tweet a link to the coupon to see the coupon code and use it.

Facebook coupons: Users must authenticate with a Facebook account to be able to use it.

Newsletter coupons: Users must enter their email address to be able to use it.

Video coupons: Users must watch a YouTube/Vimeo video and find a code to be able to use the coupon.

Trivia coupons: Users must answer a trivia question correctly to use the coupon.

Feedback coupons: Users must send a feedback about something to be able to use the coupon.