But unless a friend sends you a link to a particular item, you are likely to be served up something random.

FORBES: What's in Storage

If Amazon sells the item, the bubble has a link to put the product in the user's Amazon shopping cart, bypassing the competition.

FORBES: Window Shopping

You can link credit cards to cell phones to pay for an item by just being in the vicinity of an RFID receiver.

FORBES: Credit Card Users May Pay an Additional Fee