This is a demo app

On startup it adds two meta elements in the head section of the page, setting two properties: og:title and og:description.

The hope is that Facebook will pick these up. It will make it possible for a pointer into a liveblog entry to be properly presented on Facebook.

Update: Not surprisingly, FB did not pick up the dynamic metadata. To do so they would have to run the JS and then get the values of the metadata. That would be very advanced scraping.