Hi,

It seems your problems after the update on your Blackberry are occurring with a lot of other folks.  The way to fix the lock problem is to go into your Options>Password and set a password.  Once you do this, the lock screen feature will come back.  Warning, make sure you write down your password or make it easy for you.  No going back once you set a password other than wiping out the phone and starting over.  As far as the BBM and Facebook problem, you can try to delete the programs and reload them with Blackberry Desktop Manager.  That might fix any problems.

Doc