SocialFlow developed Optimized Publisher for Twitter and Facebook. This presentation includes intriguing stats and some pitfalls. Here are some times to skip to if you don't want to watch the entire 40-minute video.
00:00 - About SocialFlow
03:40 - Why Cassandra?
05:05 - Cassandra Usage Stats
16:28 - Example: Most occurring words
19:21 - Troubles with Cassandra
27:46 - Q&A