It seems to me that what "previews" really want is an API for the page's content...

fiddlerwoaroof on Nov 5, 2020 | parent | context | favorite | on: Facebook was used as a proxy by web scraping bots

It seems to me that what "previews" really want is an API for the page's content in a structured format: OpenGraph tags and other microformats are one representation, but it's annoying to have to load _all_ the HTML just to grab title and the OG tags.