In the olden times blogs earned trust by cultivating a reputation. The reputation was earned by having an audience that trusted them and recommended them. Cross-linking content to other blogs, guest blogging, being included on a blogger's 'blogroll,' etc. were all ways they expanded their audience.
It was slower and had much less reach, but it also focused more on "building an audience" rather than "driving traffic." We, fundamentally, don't trust content, so mechanisms that operate on validating atomized bits of content are going to fall flat. We trust people and institutions. If you want to build trust it has to work on the agents producing the content rather than the content itself. Segmenting content up into atomized bits is what creates the erosion of trust in the first place. It's something timeline driven social media feeds do specifically because it makes it difficult to parse genuine buzz from advertising, which makes the ads more effective. But that's the opposite of trustworthiness.