On-line Trend Analysis with Topic Models: #twitter Trends Detection Topic Model Online Jey Han Lau author Nigel Collier author Timothy Baldwin author 2012-12 text Proceedings of COLING 2012 Martin Kay editor Christian Boitet editor The COLING 2012 Organizing Committee Mumbai, India conference publication lau-etal-2012-line https://aclanthology.org/C12-1093/ 2012-12 1519 1534