Determining the Popularity of Design Patterns Used by Programmers Based on the Analysis of Questions and Answers on Stackoverflow.com Social Network

User-generated content in social networks constitutes tremendous stores of knowledge to be analysed. The article presented results of research on the popularity of design patterns on the basis of data gathered in the specialised social networks. The conducted analyses concerned i.a. general popularity of questions about design patterns and indicating a group of patterns which cause possible problems during implementation. The research results were obtained thanks to using data mining techniques.