#9 LinkedIn breach

LinkedIn, in June, confirmed reports that some of its users' passwords were compromised. The reports  which surfaced before the company’s confirmation said that about 6.5 million LinkedIn passwords were compromised and posted online in a Russian hacker forum, in large part because LinkedIn was using a weak hashing algorithm. The users did not take this confirmation by the company in any less anxious way.

The business-oriented social network site quickly updated its security and ensured users who updated their passwords that they'd be in much better shape, but by then the company got slapped with a $5 million lawsuit over the breach. 

Here's what one LinkedIn VP blogged:  "We sincerely apologize for the inconvenience this has caused our members. We take the security of our members very seriously. If you haven't read it already it is worth checking out my earlier blog post today about updating your password and other account security best practices."