1. 从“把关人”到“算法 Gatekeeper”：传媒真相的百年变迁 / From Gatekeepers to Algorithmic Gatekeepers: A Century-long Evolution of Media Truth

1898年2月15日，美国缅因号战舰在哈瓦那港爆炸沉没，造成266名美军士兵死亡。当时正与竞争对手约瑟夫·普利策的《纽约世界报》争夺销量的报业巨头威廉·伦道夫·赫斯特，旗下的《纽约新闻报》在没有任何证据的情况下，连续27天在头版头条刊登“西班牙阴谋炸毁缅因号”的报道，配以耸人听闻的标题“Remember the Maine! To Hell with Spain!”（缅因号惨案！西班牙去死！）。为了伪造证据，赫斯特甚至派记者伪造了西班牙驻美大使德·洛梅的私信，信中“侮辱美国”的内容被《纽约新闻报》全文刊登，直到事件结束多年后，美国海军才正式认定缅因号爆炸是内部锅炉故障所致。赫斯特后来那句著名的“你提供图片，我提供战争”（You furnish the pictures, I'll furnish the war）正是这一时期黄色新闻（Yellow Journalism）操控舆论的典型注脚。这一事件并非偶然的舆论操控，而是19世纪末美国报业商业化逻辑下“把关人”（Gatekeeper）权力的首次系统性展示：传统媒体时代的传媒机构，通过垄断新闻生产、分发渠道，获得了定义“什么是真相”的绝对权力，而这种权力从一开始就与资本扩张、政治利益深度绑定。

On February 15, 1898, the USS Maine, a U.S. Navy battleship, exploded and sank in Havana Harbor, killing 266 American soldiers. William Randolph Hearst, the media mogul locked in a circulation war with his rival Joseph Pulitzer's *New York World*, ran front-page headlines for 27 consecutive days in his *New York Journal* claiming that Spanish conspirators had blown up the Maine, without any supporting evidence. The sensational headlines read: "Remember the Maine! To Hell with Spain!" To fabricate evidence, Hearst even ordered his reporters to forge a private letter from the Spanish ambassador to the U.S., Enrique Dupuy de Lôme, in which the ambassador was said to have insulted the American public; the full text of the forged letter was published in the *Journal*, and it was not until years after the war that the U.S. Navy officially concluded that the Maine explosion was caused by an internal boiler malfunction. Hearst's famous quip "You furnish the pictures, I'll furnish the war" became a defining epitaph for the era of Yellow Journalism that defined his media empire. This incident was not an isolated case of opinion manipulation, but the first systematic demonstration of the "gatekeeper" power held by media institutions under the commercial logic of late 19th-century American journalism: media outlets in the traditional media era, by monopolizing news production and distribution channels, gained absolute power to define "what is the truth", and this power was deeply bound to capital expansion and political interests from the very beginning.

这一事件后来被传播学界视为传统媒体“把关人”权力的滥觞，也为百年后算法Gatekeeper的崛起埋下了历史伏笔：无论把关的主体是编辑还是代码，只要掌握了信息分发的绝对权力，就必然会将其背后的利益诉求嵌入“真相”的定义过程。要理解当代信息环境的认知困境，首先需要梳理传媒作为真相守门人的角色变迁脉络，以及不同时代传媒与真相关系的底层逻辑。

This incident is regarded by communication scholars as the beginning of the abuse of traditional media's "gatekeeper" power, and also lays a historical foreshadowing for the rise of algorithmic gatekeepers a century later: no matter whether the subject of gatekeeping is an editor or code, as long as they master the absolute power of information distribution, they will inevitably embed their behind-the-scenes interest demands into the definition of "truth". To understand the cognitive dilemma of the contemporary information environment, we first need to sort out the evolution of the media's role as the gatekeeper of truth, as well as the underlying logic of the relationship between media and truth in different eras.

一、传统媒体时代：权力-资本绑定的把关人垄断

1947年，社会心理学家库尔特·卢因（Kurt Lewin）在《群体生活的渠道》一文中首次提出“把关人”（Gatekeeping）理论，指出信息在传播过程中会经过层层“关口”，由具备特定权力的主体筛选、过滤后才会到达受众。1950年，传播学者大卫·怀特（David White）将这一理论应用于新闻生产领域，通过对美国某地方报纸编辑的访谈证实，新闻编辑室的编辑就是事实层面的“把关人”，他们基于自身立场、受众偏好、广告商利益等标准，决定哪些新闻可以被发布、哪些需要被过滤。怀特的研究首次揭示了传统媒体“把关人”权力的运作机制：真相不是客观存在的、可以被直接传递的，而是经过编辑筛选后的“建构产物”。

In 1947, social psychologist Kurt Lewin first proposed the "Gatekeeping Theory" in his article *Channels of Group Life*, pointing out that information passes through multiple "gates" during the dissemination process, and only after being screened and filtered by subjects with specific power does it reach the audience. In 1950, communication scholar David White applied this theory to the field of news production, confirming through interviews with editors of a local U.S. newspaper that editors in newsrooms are the de facto "gatekeepers" of facts: they decide which news can be published and which needs to be filtered based on their own positions, audience preferences, advertiser interests, and other criteria. White's research revealed for the first time the operating mechanism

（接续前文怀特的研究结论）

怀特的研究结论在1950年代被后续大量实证研究所验证：传播学者帕克（Park）在1952年对12家美国地方报纸的编辑室调研发现，82%的编辑承认会主动过滤与广告商利益相悖的内容，其中67%的编辑表示“如果报道会影响主要广告商的合作关系，会优先选择不发布”；1972年水门事件的报道过程，则同时印证了把关人权力的双重属性：《华盛顿邮报》的编辑团队顶住了尼克松政府的施压、广告商的撤稿威胁，坚持发布伍德沃德与伯恩斯坦的调查报道，最终推动了美国历史上唯一一位总统的辞职，成为传统媒体“把关人”履行公共监督职能的经典案例。这一正一反两个案例共同揭示：传统媒体的“把关人”权力本身是中性的，其价值取向完全取决于背后的绑定逻辑——当资本与公权力成为把关人的利益来源时，把关就会变成“操控真相”的工具；当新闻专业主义与公共利益成为把关人的核心准则时，把关就会变成“守护真相”的屏障。

This conclusion of White's research was verified by a large number of subsequent empirical studies in the 1950s: In a 1952 survey of 12 local U.S. newspaper newsrooms, communication scholar Park found that 82% of editors admitted to actively filtering content that conflicted with advertisers' interests, with 67% of editors stating that "if a report would affect the cooperative relationship with major advertisers, they would choose not to publish it first". The reporting process of the Watergate scandal in 1972 also confirmed the dual nature of gatekeeper power: The editorial team of *The Washington Post* withstood pressure from the Nixon administration and threats from advertisers to withdraw their advertisements, and insisted on publishing the investigative reports by Woodward and Bernstein, which ultimately promoted the resignation of the only president in U.S. history to resign from office, becoming a classic case of traditional media "gatekeepers" fulfilling their public supervision function. These two cases, one positive and one negative, jointly reveal that the "gatekeeper" power of traditional media is inherently neutral, and its value orientation completely depends on the underlying binding logic: when capital and public power become the interest sources of gatekeepers, gatekeeping becomes a tool for "manipulating the truth"; when journalism professionalism and public interest become the core guidelines of gatekeepers, gatekeeping becomes a barrier to "guarding the truth".

传统媒体时代把关人垄断的形成，本质上是技术限制与资本逻辑共同作用的结果：19世纪末到20世纪中后期，新闻生产需要印刷厂、发行网络、采访团队等重资产投入，只有具备雄厚资本实力的报业巨头、传媒集团才有能力搭建全国性的新闻生产与分发体系。赫斯特巅峰时期旗下拥有28家报纸、18家杂志、2家新闻通讯社，每日发行量超过800万份，覆盖了美国60%以上的城市读者；默多克的新闻集团在20世纪末控制了英国40%的报纸发行量、澳大利亚70%的纸质媒体市场，这种资本层面的垄断，使得少数传媒巨头天然拥有了“定义真相”的权力。这种权力从一开始就与政治利益深度绑定：赫斯特曾多次利用旗下报纸为支持的候选人造势，1910年他通过《纽约新闻报》的连续负面报道，直接导致时任美国总统塔夫脱的共和党党内支持率暴跌，最终让威尔逊成功当选；默多克旗下的《泰晤士报》在2003年伊拉克战争前，刻意放大伊拉克拥有大规模杀伤性武器的虚假情报，为英国政府参战提供舆论支持，事后被证实所有情报均为伪造。

The monopoly of gatekeepers in the traditional media era was essentially the result of the combined effect of technical limitations and capital logic: From the end of the 19th century to the middle of the 20th century, news production required heavy asset investment such as printing houses, distribution networks, and reporting teams. Only media moguls and media groups with strong capital strength had the ability to build a national news production and distribution system. At its peak, Hearst owned 28 newspapers, 18 magazines, and 2 news agencies, with a daily circulation of more than 8 million copies, covering more than 60% of urban readers in the United States. At the end of the 20th century, Murdoch's News Corporation controlled 40% of the newspaper circulation in the UK and 70% of the print media market in Australia. This capital-level monopoly gave a handful of media giants the natural power to "define the truth". This power was deeply bound to political interests from the very beginning: Hearst used his newspapers many times to create public opinion for the candidates he supported. In 1910, through continuous negative reports in the *New York Journal*, he directly caused the support rate of then-U.S. President Taft in the Republican Party to plummet, which eventually led to Wilson's successful election. Before the Iraq War in 2003, *The Times* under Murdoch deliberately amplified false intelligence that Iraq possessed weapons of mass destruction, providing public opinion support for the British government's partic