"He found that our close friends strongly sway which information we share, but overall their impact is dwarfed by the collective influence of numerous more distant contacts—what sociologists call "weak ties." It is our diverse collection of weak ties that most powerfully determines what information we're exposed to. That study provides strong evidence against the idea that social networking creates harmful "filter bubbles," to use activist Eli Pariser's term for the effects of tuning the information we receive to match our expectations." - marcell mars

"In April, influenced in part by conversations over dinner with his med-student girlfriend (now his wife), Zuckerberg decided that he should use social influence within Facebook to increase organ donor registrations. Users were given an opportunity to click a box on their Timeline pages to signal that they were registered donors, which triggered a notification to their friends. The new feature started a cascade of social pressure, and organ donor enrollment increased by a factor of 23 across 44 states." - marcell mars