Chapter Title: Twitris- a System for Collective Social Intelligence Amit Sheth, Ashutosh Jadhav, Pavan Kapanipathi, Chen Lu, Hemant Purohit, Gary Alan Smith, Wenbo Wang Ohio Center of Excellence in Knowledge-enabled Computing (Kno.e.sis), Wright State University, Dayton, OH 45435 USA {amit,ashutosh,pavan,lu,hemant,alan,wenbo}@knoesis.org Synonyms Social media analysis, Citizen sensing, Semantic social web, Spatio-Temporal-Thematic Analysis, People-Content-Network Analysis, Sentiment-Emotion-Intent Analysis, Event analysis on social media, Real-time social media analysis, Semantic perception, Interaction Network, Community evolution, Web 3.0 Glossary Citizen sensing: Humans as citizens on the ubiquitous Web, acting as sensors and sharing their observations and views using mobile devices and Web 2.0 Services. Citizen-sensor network: An interconnected network of people who actively observe, report, collect, analyze, and disseminate information via text, links to other resources, and various media including audio, images and videos. Social media analytics: Social media analytics is the practice of gathering data from social media websites and analyzing that data to gain new insights from social media and to make informed decisions. Semantic Web: Semantic Web is a group of methods and technologies to help machines and humans understand the meaning - or "semantics" - of data on the World Wide Web. Spatio-Temporal-Thematic (STT) analysis: Social media analytics taking into account what is being said about an event (theme), where (spatial) and when (temporal) it is being said. People-Content-Network analysis (PCNA): Social media analytics taking into account social media user (People), data shared on social media websites (Content) and network of social media users (Network). Sentiment-Emotion-Intent (SEI) extraction: Analyzing social media content to extract insights about social media users’ sentiment (positive, negative and neutral), emotion (happy, angry, upset, etc.) and the user's intention (seeking information, sharing information, etc.). Introduction Well over a billion people have become 'citizens' of an Internet- or Web-enabled social community. Web 2.0 fostered the open environment and applications for tagging, blogging, wikis, and social networking sites that have made information consumption, production, and