A Large-Scale Analysis of Regional Tendency of Twitter Photos Using Only Image Features

It is common activities for many people to post photos on open SNSs such as Twitter and Instagram where anyone can see all the posted photos. The difference on idea of the privacy issue at SNSs depends on culture and history. In fact, the people in Eastern Asian such Japan and Korea do not like to post human face photos to SNSs, while Western and South-Eastern-Asian people posts many human face photos. To make this fact clear and explore it deeper, we analyzed geotagged photos collected from the Twitter streams by classifying them into five kinds of rough categories, "people", "building", "document", "scene" and "food". As results, we found there are quite large differences on regional tendency of posted Twitter photos regarding the photo genre distributions.