[ollysb]

Facebook does have an internal solution for push updates, I believe they use long http requests. There were some talk of relay adding support for updates via websockets, anyone have any information?

[WimLeers]

Interesting; I'd love to read _what_ exactly they send in those long HTTP requests.

I'd think something along the lines of Surrogate Keys/Cache Tags would make sense:

- https://www.drupal.org/developing/api/8/cache/tags

- http://info.varnish-software.com/blog/advanced-cache-invalid... (ugh, they broke their site, cached at https://pinboard.in/cached/a31c4630dd2d/)

- https://www.fastly.com/blog/surrogate-keys-part-1

- https://blog.cloudflare.com/introducing-a-powerful-way-to-pu...

[sanderjd]

Woah, thanks for those links. All very useful.