11 data breaches that stung US consumers
Affected: The personal information of 100 million user accounts was stolen.
Cost: About $1.7 billion (Ponemon Institute estimate)
What happened: Hackers stole data from PlayStation Network and Sony Online Entertainment users, forcing Sony to shut down the networks temporarily. Larry Ponemon, founder and chairman of the Ponemon Institute, said the company had to provide discounted pricing to keep customers.