This document discusses how the Dachis Group uses Cassandra and Hadoop for social business intelligence. They collect raw social media data and normalize it for analysis in Cassandra. Hadoop is used to calculate foundational metrics. The data is enriched and analyzed using Pig and Oozie workflows. Metrics are stored in Postgres. They launched products like the Social Business Index and Social Performance Monitor to measure social media effectiveness for companies. Lessons learned include dealing with big data bugs and involvement in open source communities.