This document discusses designing systems for social sharing on the web. It notes that the web has become increasingly social with the rise of broadband access and online games. It defines social sharing as putting objects at the center of interactions, allowing people to share content like photos, videos, bookmarks and rate news stories. It provides eight principles for designing such systems: 1) make them personally useful, 2) identify the symbiotic relationship between personal and social features, 3) create a porous boundary between public and private, 4) allow different levels of participation, 5) let people feel the presence of others, 6) provide moments of independence, 7) allow for alternative viewpoints, and 8) enable serendipity and play. The goal