Guys. Be extremely careful with this stuff. I tried to do "At Home Rewards" and "Privacy Matters" and it told me that it couldn't verify my card. Well, they went ahead and charged me the $1 buck or whatever, as well as the full 20 dollar subscription fee anyway. I had the charges reversed...
Been messing around with this as well, up to a decent amount of points. Watch out for the "free trial" offers that sign you up for 3 or more different services. Be sure to cancel them all if you don't want to get billed - not hard to do though.
If someone wants to help me out, my referral is...