“…The metadata include the number of retweets, likes, lexically similar tweets (i.e., duplicates), twitter followers and friends (i.e., social rank), replies to tweets, as well as hashtags, handles (i.e., indicated by an @ appended with a username), and demographic data of the person who tweeted. • Ali et al [66] and Han et al [75] used user comments on Facebook and Weibo, respectively. Seven out of 11 studies that used microdata performed sentiment analysis of tweets [64-66, 68, 69, 72, 73] Online discussion/forum Eight studies (12%) elicited requirements from different online discussion forums: online forum posts from the feature tracker of the Password Safe project on SourceForge [76], questions and answers on Stack Overflow [77], and feature requests from open-source forums of SugarCRM, SecondLife, and an Amazonlike portal specifically developed for students [78], OpenOffice online discussion forum [79], the Reddit forum [80][81][82], and the VLC media player and Firefox web browser forums [83]…”