UPDATE: BPS Pro 13+ and BPS 2.0+ versions have a feature called: Setup Wizard AutoFix (AutoWhitelist|AutoSetup|AutoCleanup) that automatically creates plugin and theme whitelist rules and automatically sets up and cleans up caching plugins htaccess code.
1. Copy the code below to this BPS Root Custom Code text box: CUSTOM CODE PLUGIN/THEME SKIP/BYPASS RULES
2. Click the Save Root Custom Code button.
3. Go to the BPS Security Modes page and click the Root Folder BulletProof Mode Activate button.
# Nextend facebook connect skip/bypass
RewriteCond %{QUERY_STRING} loginFacebook=(.*) [NC]
RewriteRule . - [S=13]