WTF: the who to follow service at Twitter

@article{Gupta2013WTFTW,
  title={WTF: the who to follow service at Twitter},
  author={Pankaj Gupta and Ashish Goel and Jimmy J. Lin and Aneesh Sharma and Dong Wang and Reza Bosagh Zadeh},
  journal={Proceedings of the 22nd international conference on World Wide Web},
  year={2013}
}
WTF ("Who to Follow") is Twitter's user recommendation service, which is responsible for creating millions of connections daily between users based on shared interests, common connections, and other related factors. This paper provides an architectural overview and shares lessons we learned in building and running the service over the past few years. Particularly noteworthy was our design decision to process the entire Twitter graph in memory on a single server, which significantly reduced… 

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