Yep. Click on the bluetooth logo on the menu in the upper right of your screen. The list coming up has all devices in it which have been paired with your mac. The ones that are bold are currently connected.
I don't know how bluetooth relates to Facebook - if you are concerned about your Bluetooth, simply turn it off. If you need it on, just go to the Bluetooth Preferences and make sure you are not discoverable.
On the Facebook note: Open the FB home page on your site and change the password.
I'm more worried about the damage having been done. When someone get's your phone they can wreak havoc on your world. Also syncing to your computer can make more problems. I just wanted to see If any devices have been paired that aren't listed.
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