In general, you don't need to update passwords unless you have deauthorized your logins from FB or Twitter (assuming you're talking about connecting your community account to FB & Twitter, and not something like the SMM product).
But you can check it in My Settings > Social
If you're not talking about your personal community account, though, then let us know.
Welcome to the Technology board!Curious about our platform? Looking to connect on social technology? You've come to the right place!