Re: Blocking https facebook/youtube
>>This method will block all https websites, including google and other useful websites.
If you are seeing all HTTPS sites blocked, you have most likely enabled deep-inspection without importing the right Certificate.
If you only set add the Facebook and Youtube domain in the Web Filter, other sites will not be affected. If you enabled certificate-inspection, the Fortigate will scan the SSL sessions for the host name and block them even if they are redirected from HTTP.