Even in text, there is more context. For example, I am more likely to trust the wikipedia article about a deeply technical topic than an article about politics

Even in text, there is more context. For example, I am more likely to trust the wikipedia article about a deeply technical topic than an article about politics or a celebrity, because the technical article is far more likely to only be edited by people who are actually very knowledgeable on the topic, and there is very little incentive to lie (in general, there are exceptions).