The new Consumer Reports serves up what it labels, in big letters on the magazine’s cover, the “7 biggest online blunders.” They’re mostly about compromising the security of your identity, things that can lead to your bank account being emptied, your credit card being enjoyed “offsite,” your computer being debilitated. The list itself wasn’t online at consumerreports.org, but it boils down to notions that are common sense and ought to be second nature by now: Employ and update security software, don’t use the same password for all accounts, etc.