1 Billion Yahoo User Accounts were Hacked
Last week, Yahoo disclosed that 1 billion user accounts were compromised in 2013. Not only is this the largest breach ever disclosed, it's larger than the next nine non-Yahoo breaches combined.
Breaches of this scale harm not only Yahoo, but your personal information, bank account, social media account and others important details that your are using Yahoo as your primary email.
To secure your Yahoo Account change your password, reset questions and answers. If you have the option, you should also enable two-step verification for added security.
Another option is to use GMAIL or HOTMAIL as your primary email.