AddThis is a social bookmarking service that can be integrated into a website with the use of a web widget.
HTTP Strict Transport Security (HSTS) informs browsers that the site should only be accessed using HTTPS.
HTTP/3 is the third major version of the Hypertext Transfer Protocol used to exchange information on the World Wide Web.
Open Graph is a protocol that is used to integrate any web page into the social graph.
Sucuri is a cybersecurity company that provides website security solutions and services.