Glen Allsopp authored a report about how to build a blog with over 10,000 subscribers. He details his experience growing his blog ViperChill from 30 subscribers to over 10,000 subscribers in a year. He emphasizes focusing on quality content, guest blogging, narrowing connections to key influencers, and search engine optimization as the key factors for his success. Allsopp also provides statistics on his blog's traffic sources and growth in pageviews, visits, and subscribers over time.