3. LivingSocial Breach
E-commerce startup LivingSocial was forced to reset all 50 million accounts of its users following a massive data security breach announced in April. The cybercriminals also accessed names, email addresses and the date of birth of its users. The LivingSocial breach included passwords, which the company said were hashed and salted at the time of the breach. Attackers could still crack the passwords with more powerful automated tools, according to security experts.