Some details about the app...you can sign up with Facebook. You will be able to see if your friends use Cartwheel and what offers they've used unless they've been added privately. Another thing. You only get a certain amount of spaces you can put offers in. Once friends join the app you get another space. So invite friends for more spaces!
All in all I highly recommend this app, especially if you shop at Target quite a bit.
Well...until next time!