Behavioral analytics in social and ubiquitous environments : 6th International Workshop on Mining Ubiquitous and Social Environments, MUSE 2015, Porto, Portugal, september 7, 2015; 6th International Workshop on Modeling Social Media, MSM 2015, Florence, Italy, may 19, 2015; 7th International Workshop on Modeling Social Media, MSM 2016, Montreal, QC, Canada, april 12, 2016; revised selected papers (2019)