Google now knows when its users go to the store and buy stuff by @lizzadwoskin and @craigtimberg via @washingtonpost

You see an ad online. You go into a brick-and-mortar store and buy the item advertised. But the advertisers have no way of tracking your in-person purchases. At least, until now. "Google will begin using data from billions of credit and debit card transactions—including card numbers, purchase amounts and time stamps—to solve the advertising juggernaut's long-standing quest to prove that online ads prompt consumers to make purchases in brick-and-mortar stores, the company said."

Interesting.  I can see so many privacy holes and risks in this.