How Facebook.com knows about duplicate pages on my site?

They are the same resource.

The actual URL is http://example.com/?{post_type}={post_slug}

The rewrite URL (via permalink settings/.htaccess) is http://example.com/{post_type}/{post_slug}/

Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)