Change

social redundancy makes people accountable.

the concepts I’ve described in earlier chapters—including bridge width, relevance, reinforcement, and social clustering—

wide bridges between them.

Principle 1: When people need social proof that a particular innovation will be useful for them, then similarity with earlier adopters is a key factor for creating relevance. People become convinced about the usefulness of a new diet, an exercise program, or a cosmetic treatment only when they see people similar to themselves adopting it. Principle

The seven strategies of change require a change in thinking. They require shifting your attention from the goal of spreading information to the goal of propagating norms.

Network centralization made the entire population—both Democrats and Republicans—biased toward the central person’s viewpoint.

clustering preserves diversity. Not demographic diversity. But informational diversity.

bridges across groups can facilitate learning and mutual understanding, but only when these interactions are framed in a way that makes diverse participants relevant to each other.

random contacts have families and friends whose paths will likely never cross yours. Because these people exist outside your immediate social network, any contact you have with them gives you a rare connection to their social networks—to people whom you will, in all likelihood, never meet. These “weak” connections do not usually evolve into “strong