Bllippy

I meant to post this earlier when I heard of it through a more direct source, but again, buyer beware it seems, and I may post more soon about Google and them showing your house online based on your computer's MAC address which is commonly tied to email and other online activity, but back to Blippy:

several credit card transactions shared on social networking site Blippy have been exposed -- with full credit card numbers included -- in Google search results.

http://www.cnn.com/2010/TECH/04/23/credit.card.numbers.mashable/index.html?hpt=Sbin