Is there a relationship between popularity of a given technology on Stack Overflow (SO) and Hacker News (HN)? And a few words about causality dgwozdz 3rd JUNE 2018 Last update: 08th JULY 2018 Table of Contents Introduction How to cope with problem Exploratory Data Analysis Granger causality Summary Further research Acknowledgments 1. Introduction Stack Overflow and Hacker News are portals mainly (