Facebook guiding principles

Applications should be Meaningful.

Social: Helps users interact and communicate more effectively by using information from the social graph
Useful: Delivers value to users by addressing real world needs, from entertainment to practical tasks
Expressive: Enables users to share more about who they are and about the world around them.
Engaging: Provides a deep experience that users want to come back to regularly

Applications should be Trustworthy.

Secure: Protects user data and honors privacy choices for everyone across the social graph
Respectful: Values user attention and honors their intentions in communications and actions
Transparent: Explains how features will work and how they won’t work, especially in triggering user-to-user communications

Applications should be Well-Designed.

Clean: Designed to be intuitive, easy to use and free of mistakes
Fast: Achieves low latency while scaled to handle user demand
Robust: Maintains reliable uptime and minimizes error rates
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