I am a huge Dreamforce fan. This is my 3rd Dreamforce and every year its bigger and more exciting. I am awe struck at the sheer volume of attendees and the fact that Salesforce has outgrown Moscone Center and now controls meeting space in 3 separate hotels.
This is by far the most work I have put into a social marketing campaign. Images, links, and speaking sessions had to be coordinated to drop at specific times through the day. (more about that after the event)