The Geo Blog demo is meant to exhibit the ability of Geocode to pull information from sources you're already using.  In this case, a photo blog site.  The blogger uploads a new photo from a device that's location aware (like an iPhone).  When the photo is added to the site, the Geocode module reaches in and grabs the photo's EXIF data.   It then pulls out the locative information and stores it in the Geo module.