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Lanyrd.com
How we bootstrapped Lanyrd
 using Twitter’s social graph



   Simon Willison @simonw
Lanyrd.com




  Definitive database
 of professional events
      and speakers
Lanyrd.com




  Definitive database       Social event recommendation
 of professional events   Comprehensive speaker profiles
      and speakers        Archive of slides, notes and video
Lanyrd.com




             Demo
Lanyrd.com



Why does it work?
•The right crowdsourcing incentives
•Wiki-style shared ownership
•The parts support the whole
•Twitter!
Lanyrd.com



Why Twitter?
•It’s where the event discussion happens
•Speakers promote their Twitter accounts
•Follow beats Friend for recommendations
•Culturally amenable to public profiles
Lanyrd.com



Bootstrapping
•Classic social software challenge
•Our secret weapon: the speakers!
•Twitter accounts are public identifiers
•(and speakers have lots of followers)
•500 profiles before launching our beta
Lanyrd.com




        More demos
Lanyrd.com




    Key Twitter APIs
Lanyrd.com



    friends/ids.json
   [43593, 19972629, 778518,
   1249881, 70478255, 3829151,
   350373, 12161, 13141, 751953,
   22785347, 2633711, 14835908,
   143883, 14159138, 11963132,
   14917418, 15732699,
   756475, ...]
Lanyrd.com



 friendships/create
Lanyrd.com



  users/search.json
Lanyrd.com




    Under the hood
Lanyrd.com
Lanyrd.com


  Secret weapon #1: Redis
Lanyrd.com


   Secret weapon #2: Solr
Lanyrd.com




Redis set intersection
Lanyrd.com



Calendar
•Pull user’s friends/ids.json
•Cache for ten hours
•Store in Redis
•Solr search: attendees:(34722 OR 1312313 OR...
Lanyrd.com




       Pros and cons
Lanyrd.com



Pros
•One-click signup
•Naturally viral
•Instant personalisation
•Pre-created profiles, ready to be claimed
•APIs are pleasant to work with
Lanyrd.com



Cons
•One big, scary dependency
•No namespace control
•Hard to optimise, as no local graph copy
•Some users follow/are-followed a LOT
•OAuth permissions...
Lanyrd.com



    Permissions hell
Lanyrd.com




               Tweet this:
 @lanyrd attending
   #londonweb
             lanyrd.com/adthp

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How we bootstrapped Lanyrd using Twitter's social graph