1 Introduction  
2 Problem Definition  
3 Taxonomy by Influential Factors  
3.1 Geographical Influence  
3.2 Social Influence  
3.3 Temporal Influence  
3.4 Content Indication  
4 Taxonomy by Methodology  
4.1 Fused Model  
4.2 Joint Model  
5 Taxonomy by Task  
5.1 General POI Recommendation  
5.2 Successive POI Recommendation  
6 Performance Evaluation  
6.1 Data Sources  
6.2 Metrics  
7 Trends and New Directions  
7.1 Ranking-based Model  
7.2 Online Recommendation  
8 Conclusion