videobox-[social] is an experimental feature. Long story short: the system recognizes the type of url entered and tries to write the social iframe without any plugin or api registration.
Unfortunately this system is not always possible nor is it always feasible if you are not logged in to the social network itself.
Facebook video via url [iframed]
NOTE: no api facebook video can't support every link without an id. exemple: "https://fb.watch/4U0bRaoUu0/"
Instagram video via url
Vimeo video via url
Youtube video via url
Twitch video via url
Twitter video via url
Video social auto settings:
All social videos have a data-sets='[clearui,controls,autohide,autoplay,loop]'. For this type of test follow this list: