First cash-back app on Facebook is looking for an outstanding logo. Can you help us?

itaddsapp

itaddsapp is a startup offering users the ability to earn Facebook Credits for shopping online. It can most closely be compared to a cash-back system or app.

It would be nice if the logo would fit well into a "info" page in a similar fashion to branchout.com or identified.com as well as look good standalone. Please keep this in mind when designing the logo.

Websites we like: twitter.com, opinionaided.com, skype.com, wepay.com, spotify.com, moo.com, apple.com

To get more information on our idea please visit http://www.discountshuffle.com. Please ignore the current name, logo, colors, layout and design as we are looking for a completely new logo. We are also planning on completely redesigning the website in the next step so please do not draw any inspiration from the site beyond understanding what type of app we are developing.

Don't want:
Flipped letters
Heavy shadows
Multiple (5+) colors
Use of .com in the logo

Please consider three versions of the logo:
1x for the main website, which can be of any size or shape
1x for the Facebook app, 50x50px
1x for the Facebook app, 16x16px

The 50x50 and 16x16 version could look the same if the design works in both sizes.