Rich media embeds

[erincerys]

Presently, linking to a post through priviblur doesn't generate a page with the required meta tags to offer rich media embeds when linked where this would be supported.

Tumblr itself provides this functionality for blogs that are not private or login-gated, supporting text posts and for media posts, at least the first piece of media.

Rich media embeds ought to be supported at least to parity with Tumblr itself, but preferably with some solution to include all pieces of media in a post with multiples. (e.x. tpmblr.com solves this by generating a "screenshot" of the post)