Second batch of use cases#21

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rick446 wants to merge 13 commits intomongodb:masterfrom

rick446:rc/social-updates

Commits on Apr 4, 2012

Commits on Apr 6, 2012

Commits on Apr 11, 2012

Adding social graph and update document (partial, working through schema design)
rick446
committed

Commits on Apr 12, 2012

More details and operations
rick446
committed

Commits on Apr 13, 2012

Finish draft of social networking doc
rick446
committed

Commits on Apr 14, 2012

Make a note indicating that the index on (month, user_id) is extraneous
rick446
committed