Those who post on vertical scope sites (like mc.net) might want to change passwords used on other sites, including this one, if you use the same username, and especially if you use the same username and password here as there. More info on the breach is at http://www.verticalscope.com/about-us/notice-of-data-breach.html
To be clear - this site has not been hacked. But the hackers may have your credentials from vertical scope sites (including mc.net). If you use the same login credentials here, then they could access your profile.
To change your password here, go to the upper right side of the page where you will see your user name. Select “user control panel” from the drop-down menu, then select the “profile” tab, then the “edit account settings” menu option.