The daily deal site Plum District has a great offer today: Refer 4 friends to the site and earn a $20 Target gift card. They don’t need to make a purchase to “count” as one of your friends; just signing up with the site is enough. After you get your four signups, they’ll mail the gift card to the address that you specify. The gift card is good on anything at Target stores or

This offer is only good for today, so sign up now and start referring friends.