FOUR ASPECTS OF RELEVANCE IN SHARING LOCATION-BASED MEDIA: CONTENT, TIME, LOCATION AND NETWORK Topics: Multimedia and User Interfaces; Searching and Browsing; Web Geographical Information Systems; Web Information Filtering and Retrieval In Proceedings of the 7th International Conference on Web Information Systems and Technologies WEBIST - Volume 1, 413-417, 2011 , Noordwijkerhout, Netherlands