[header] How to deactivate facebook on blackberry [title] Launch facebook. [step] Locate the blue " f " app icon of facebook on your blackberry device and tap it. [title] Log in. 
[step] You may still be logged into your account after your previous session. If this is so, just skip this step; otherwise, enter the email address, or username, and password of the account you want to deactivate into the fields on the welcome screen.