1. Introduction  
1.1. Introducing Commonly Used Terms  
1.2. Motivation  

2. Topic-Based Link Prediction and Community Discovery  
2.1. Topic-Based Link Prediction  
2.2. Topic-Based Community Discovery  

3. Information Diffusion and Role of Influence  
3.1. Topical Information Diffusion on Social Networks  
3.2. The Role of Influence  

4. Topic Lifecycle on Social Media  

5. Topic Dynamics and Familiarity/Similarity Groups  

6. Geo-Spatial Topical Communities and Their Evolution  

7. Discussions