The document discusses 10 lessons learned from the design of SlideShare, a social media platform for sharing presentations. The lessons include: (1) using an alpha version to get early feedback, (2) not needing detailed personas when users are well known, (3) launching early and refining based on feedback, (4) social websites requiring different design than individual apps, (5) using simple analytics to get quick feedback, and (6) the importance of designer-developer collaboration. The document also discusses the value of technical simplicity, prioritizing speed, and finding developer partners to help with execution.