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The opinion dynamic is driven by two variables, people\u2019s perceived peer support and willingness of opinion expression. The perceived peer support influences the willingness of opinion expression, and the willingness influences the dynamics of real opinion\u2010expression. First, the quasi\u2010experimental study recruited twenty\u2010five participants as the observation group and found that decreasing perceived peer support would significantly increase individuals\u2019 expression willingness to protect his\/her opinion. To generalize the individual level findings to a collective level, the second study treated the social media chat groups as an undirected fully\u2010connected social network and simulated people\u2019s opinion expression dynamics with an agent\u2010based model. The simulation indicated that (1) with the help of increased willingness of opinion expression, the minority opinion supporters as a collective did not fall silent but continue to express themselves and (2) increasing willingness of opinion expression would maintain the existence of minority opinion but could not help the minority reverse to the majority.<\/jats:p>","DOI":"10.1155\/2021\/2304754","type":"journal-article","created":{"date-parts":[[2021,1,9]],"date-time":"2021-01-09T20:50:39Z","timestamp":1610225439000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":4,"title":["Opinion Expression Dynamics in Social Media Chat Groups: An Integrated Quasi\u2010Experimental and Agent\u2010Based Model Approach"],"prefix":"10.1155","volume":"2021","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-9644-6298","authenticated-orcid":false,"given":"Siyuan","family":"Ma","sequence":"first","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4036-9609","authenticated-orcid":false,"given":"Hongzhong","family":"Zhang","sequence":"additional","affiliation":[]}],"member":"311","published-online":{"date-parts":[[2021,1,9]]},"reference":[{"key":"e_1_2_8_1_2","first-page":"34","article-title":"On the information flow mode, demassification communication and the influence of mass media over the social cohesion under the age of media convergence","volume":"5","author":"Jing M.","year":"2011","journal-title":"Journalism & Communication"},{"key":"e_1_2_8_2_2","first-page":"54","article-title":"Comparison of communication mechanism between micro-blog and WeChat under different identity","volume":"3","author":"Chen Y.","year":"2015","journal-title":"Press Circles"},{"key":"e_1_2_8_3_2","article-title":"Some ideas about the future development of the media industry","volume":"1","author":"Yu G. 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