The Twitter hashtag for the conference is "LIB2012" (click to see search results)
Here is a quick blurb on the conference you can use to encourage participation:
The Library 2.012 Worldwide Virtual Conference - October 3 - 5
The virtual Library 2.012 conference is a unique chance to participate in a global conversation on the current and future state of libraries. Held worldwide over the course of two days, with 150 sessions and 10 keynotes, subject strands include physical and virtual learning spaces, evolving professional roles in today's world, organizing and creating information, changing delivery methods, user-centered access, and mobile and geo-social information environments. Attendance is free; sign up at http://www.library2012.com to attend or to be kept informed.