That’s because every news organization/blog you’re familiar with scans Reddit for interesting stories cultivated by the company’s highly engaged (read: addicted) user base.
Reddit’s front page aggregates stories and pictures from some of the more interesting “subreddits” and displays for users an eclectic mix of news, memes, pictures, and discussions. Each user can customize the topics (subreddits) to be displayed on their respective front page for a personalized experience.
Because most of the content is submitted by users (and voted “up” or “down” by them), news organizations have a clear picture of which pieces of original content resonate with people.
Hence, Reddit both produces and vets potential stories, making short work of the reporting process for bloggers and reporters. If it’s on the front page of Reddit (meaning it got enough “upvotes” to get there), the audience has spoken.
So, what does Reddit have to do with public relations?