Domain generic large scale topic expertise and interest mining across multiple online social networks

The system relates to a system and apparatus for a scalable engineering system deployed in production that mines topical interests from multiple social networks and assigns over tens of thousands of topics to hundreds of millions of users on a daily basis. The system extracts and analyzes features for topic inference that extend beyond authored text. The system uses a diverse set of features and cross network information can lead to a better understanding of a user's interests. This system focuses on assigning topics for a user that other users can socially recognize and acknowledge.