https://haveibeenpwned.com/
This website will tell you if any of the e-mail addresses that you own has been involved in any data breach hack.
This is not a joke website, as I have validated myself that the data is legit. I own various e-mail addresses, some of which are used exclusively for a particular financial service (anyone hacking my personal e-mail address will have no access to anything whatsoever that contains financial info or funds).
The e-mail address I used exclusively for Neteller is identified as being breached by a Neteller hack.
The e-mail address I used exclusively for Moneybookers/Skrill is identified as being breached by a Moneybookers hack.
One of my e-mails has been compromised by Dropbox, Majorgeeks and Linkedin hacks.
Fortunately I never repeat passwords (keepass ftw), so I am not too concerned with these breaches. How about you?
(Gabethebabe, btw. I forgot I was posting on this gimmick)