:;twitter:: 

It's become more and more common in recent years for shoppers to be asked for their zip code at the cash register when making a purchase with a credit card.

But experts are advising you not to do it!  They say giving your zip code makes it much easy for retailers to get your address, phone number and personal info. That can mean more junk mail and more telemarketing calls for you, either from the retailer itself or from other people who want to sell you stuff if the store sells your profile to a "data broker"!