Atom threading

Reading about Salmon this morning and its use of Atom Threading (RFC 4685) reminded me that before anybody outside of Google had ever heard about Wave, let alone place-locating Wave bots (see slide 15) that would geocode and annotate places that you mention, I'd suggested that you might arrange for an app to walk your posts and leave geographic annotation in comments using the same Atom extension. Salmon might make the arrangement unnecessary: geotagging might just come knocking.