The dating website Plentyoffish was hacked last week exposing usernames, emails and passwords, according to Mashable
Plentyoffish CEO Markus Frind says that the security flaw has been fixed but it appears that the dating site still hasn't made an official statement about the hack so users should still take caution.
There are a few sides of the story (and very interesting). You can read Markus Frind's personal blog here
or read a post by the hacker here.