Building a follower model from scratch

“Our follower graph has millions of nodes and billions of edges, making it an interesting challenge to maintain and scale data as we build out the interest graph. The model is similar to those of Twitter or Facebook, but with some key differences based around interests that we account for in the product development and design phases.

The final version of the Pinterest follower service was developed, migrated and deployed in about 8 weeks with one full time engineer and 2-3 part time engineers.

Here I’ll explain how the service-oriented architecture has helped us develop and maintain the service as a unit of its own…”

http://engineering.pinterest.com/post/55272557617/building-a-follower-model-from-scratch