One good post, article, or piece on Web 2.0 often leads to another. You can use your precious pearl of a piece to find similar items by taking a closer look at the author. Click their link and see:
For example, Ari Berkowitz wrote an article that appeared on The Conversation. Clicking on his bio and then selecting Articles, shows what other articles he wrote.
In addition, you can check the sites that have linked to and discussed your pearl of an article. For this, you'll need a back link checker like Ahref's Backlink Checker.
Back link checkers show a variety of sites that you can visit for more information.
A variation of reaching out is visiting links that come with images on Pinterest. Open an image and look for link to a web site. Sometimes you have a site selling a product, but sometimes a site with credible information lies behind the image. The image of the bird, that links to ebaumsworld.com could fall into either category.