注释:
①2016年底新浪微博的月活跃用户数(MAU)突破3亿,“刷微博”已经成为中国投资者日常重要的网络活动之一。截至2016年6月,已有857家A股上市公司在新浪平台开通官方微博,占上市公司总数的29.08%。
②例如在2011年3月15日,中兴通讯在其官方微博上宣布,中兴通讯将与马来西亚运营商Umobile合作,为其在马来西亚的主要城市建设HSPA+/LTE 网络,次日中兴通讯的股价上涨了近4%。又如,在2012年10月23日,SOHO的董事长潘石屹在他的个人微博中宣布,上海市中心SOHO复兴广场的幕墙项目选中江河幕墙承建,这个信息发布仅仅7分钟后,江河幕墙的股价就向上拉升了约2%。
③2013年4月2日美国证券交易委员会(SEC)的明确,公司可以使用脸书(Facebook)和推特(Twitter)等社交媒体发布公司业绩等公告,但事前需就公司信息发布平台事宜通知投资者。
④2013年6月21日,中国证监会新闻发言人发布。
⑤参考李培功(2010)等研究,本文选择了八家国内主要财经媒体作为媒体报道的来源,即《中国证券报》、《证券时报》、《证券日报》、《上海证券报》、《经济观察报》、《中国经营报》、《21世纪经济报道》和《第一财经日报》。
⑥参考胡军(2015)的做法,本文按下面的标准判断某上市公司是否开通官方微博:(1)仅以新浪微博进行研究。因为新浪微博的用户量是信息可得的其他类型社交平台和微博平台无法比拟的。(2)必须是加蓝V认证的上市公司总公司的微博。(3)或者必须是上市公司官方网站上公布的官方微博。经过以上筛选标准,截至2015年12月底,共有829家A股上市公司开通官方微博,占整个上市公司总数的28.13%。
⑦考虑到制造业的特殊性,我们对其使用证监会二级分类,其他行业采用一级分类。
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