Recently there has been news of password lists being liberated from a variety of commonly used websites. If you have any worries that any of your passwords have been compromised have a look at:
http://www.zdnet.com/how-to-find-out-if-your-password-has-been-stolen-7000023990/?s_cid=e589&ttag=e589
and enter your email address(es) into:
http://haveibeenpwned.com/
Cross posted to Computer forum