Facebook announced on March 5, that it is turning on a new capability that will automatically direct users to an HTTPS secured version of a link target, if one is available.
The feature known as HTTP Strict Transport Security (HSTS) preloading is being rolled out across facebook.com and Instagram. With HSTS preloading, a site link that a user posted as just HTTP will automatically be directed to an HTTPS link for a given site.
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