By asking what's happening or what's on our minds, Facebook and Twitter have prodded people to broadcast just about anything, from what they ate for lunch to what movie they're going to see. Now a new site wants to unearth more - by asking people to automatically reveal things they buy.

Blippy, which is backed by a Twitter co-founder, asks people to share their spending habits. If you register a credit card with the site, every transaction bought on the card would be displayed to your friends on Blippy.

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"For people that already talk about what they buy on Twitter, this could be harnessing that kind of energy," said Amanda Lenhart, a senior researcher at the Pew Internet and American Life Project.

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