Heartbleed Bug is a serious flaw in the OpenSSL. Over 3/4 of the internet is now susceptible to this bug, which has in fact been out for nearly 2 years (but just discovered this past week)! Is your information safe online? Marketing Essentials suggests that you immediately change all of your online passwords, just to be safe.
To learn more about the Heartbleed Bug, visit the website specifically dedicated to this security flaw.