So what is a 'Hashtag printer'? Well for one, it's not a printer designed only to print images of hashtags. That would be highly impractical and slightly insane. To explain it simply, hotel guests can snap a photo on their phone, then share it on social media with the hotel's unique hashtag. The photograph can then be printed via a kiosk in the lobby or reception area for FREE. The guest is rewarded with a physical print-out just for telling everyone about their stay. It's a classic win-win.