It might service some of your watched repos because of data quality issues. It uses a very basic nearest neighbor shared item set model. I'm definitely planning on improving the quality of the results in the near future.
Examples...
Ranked similarity search https://groups.google.com/d/msg/neo4j/tuoqDlq45ys/1g1G9nTzjh...
Multi-Item Based Recommendation https://groups.google.com/d/msg/neo4j/XlGGdsSedVw/7pCPqghA84...
Recommendation engine https://groups.google.com/d/msg/neo4j/_dnyanUSmtk/eDhJ6rjNCn...