People keep on posting images on Instagram, and these need classification. There is a method of nomenclature and and taxanomy for the the photographs on social media. If the Gateway of India photo is reflected in the rainwater, it is a #puddlegram. A shadow of yourself in a garden is #shadowselfie. Airplanes flying across the skies are #planespotting. There are #travelgrams, #hotelview, #airportlife hashtags. Porn is used in the classification as a ubiquitons suffix, e.g. #foodporn, #natureporn, #cloudporn. A city can be photographed, e.g. #Paris but if you want to see illuminated Paris at night, you can go to #Parisbynight.