Chapter1. Having Fun?: Personalized Activity-based Mood Prediction in Social Media.- Chapter2. Automatic Medical Image Multilingual Indexation through a Medical Social Network.- Chapter3. The Significant Effect of Overlapping Community Structures in Signed Social Networks.- Chapter4. Extracting Relations Between Symptoms by Age-Frame Based Link Prediction.- Chapter5. Link Prediction by Network Analysis.- Chapter6. Structure-Based Features for Predicting the Quality of Articles in Wikipedia.- Chapter7. Predicting Collective Action from Micro-Blog Data.- Chapter8. Discovery of Structural and Temporal Patterns in MOOC Discussion Forums.- Chapter9. Diffusion Process in a Multi-Dimension Networks: Generating, Modelling and Simulation.