Siri is an awesome time saver. Want to view your most recent calls, text someone, get directions, or post to Facebook? Just ask Siri. You can even do all this from your lock screen. The problem is, so can anyone else. If your settings allow for it, anyone can access your call history, send a tweet, or get directions to a contact's home from your lock screen just by bringing up Siri and asking.
If the idea of anyone being able to access this information from your lock screen freaks you out, go to Settings > Touch ID & Passcode, enter your passcode, and scroll down to Allow Access When Locked and toggle Siri off.
You can still ask Siri to sort your call history for you, tweet, and send messages, as well as do a host of other things, just not from the lock screen.
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