One rule of thumb for maintaining data security is changing passwords on a regular basis. Why? Because security bugs are discovered all the time and those bugs are exploited.
This week the Heartbleed security bug was made public. As this article from The Wire says, “What should you know about Heartbleed, a recently uncovered security bug? The shortest version: You’ll have to change all of your passwords, and temporarily avoid any site that is known to be vulnerable.“
Oh, and security bugs aren’t always announced when they are found. According to Bloomberg, the NSA may have been exploiting the Heartbleed bug for years.
Change those passwords, people!