“…Particularly, photos are the most popular resources that users want to share through SNS (e.g., Facebook, Photobucket, Instagram, Flickr and so on). In the social tagging from SNS, there have been many studies which concentrate on the two main aspects; i) to understand collective behaviors among online users, and ii) to provide online services to users [6]. Most of these studies [4,5,10] have commonly introduced some methods to exploit the social tagging for extracting meaningful patterns and providing various services, e.g., information searching and recommendation.…”