The document discusses lessons learned from the design of SlideShare, a social media platform for sharing presentations. Some key lessons include: 1) For early versions, focus on getting the basic concept across with flexibility rather than over-designing. Get feedback from real users to refine over time. 2) With a social media site, design differs from individual use - focus on people interacting and the "wisdom of crowds" over individual usability. 3) The designer-developer role is important for efficient communication and reduced design work. Design deliverables should be approachable and editable by all.