Pingback for LiveJournal.
Short, concise description of the idea
Automatic 'referenced' links.
Full description of the idea
This system has existed for a while in the more general weblog community, and is best summerised here. To quote; "It basically boils down to telling a Web log when you've linked to it, by fetching the page, looking for a header advertising a pingback server, and then invoking an XML-RPC call on that server. The best thing about this idea is that unlike similar schemes like TrackBack, it is totally transparent to both users. It is also software-agnostic, so any Web logging system can implement pingback and interoperate with all other pingback-enabled Web logs." So basically; when a user posts a new entry, LiveJournal goes through it (the user could select Pingback to be enabled for that entry, or have it automatically on) and notes any links to other LiveJournal entries [external to that users journal]. LiveJournal then goes to the linked entry and adds an new 'referer' link to the 'Pingback box' at the bottom of the comments page.
An ordered list of benefits
An ordered list of problems/issues involved
An organized list, or a few short paragraphs detailing suggestions for implementation