Is there an option to start a new discussion by passing parameters through the URL or having a bookmarklet?
So that you could for example have a Bookmarklet in your browser and when you click on it the current page URL plus some custom tags are auto-inserted into a start discussion popup.
This way Flarum could work as a collaborative link sharing system a bit like Shaarli etc.
With such a link a "share on Flarum" option could also be implemented on other pages, for example the RSS reader FreshRSS I am using has a really easy to modify "share as" option that would allow sharing links on Flarum with other users for discussion really easily.