You can ask questions in advance to Social Networking researcher danah boyd!
An addition to the danah boyd visit announcement [Thursday, Sept 14, 2 pm, Toy Lounge]:

Our discussion will be structured by audience questions. Attendees are invited to submit questions in advance. Questions may be posted as comments to the blog post noted below, or submitted to Fred Stutzman at
fred at metalab.unc.edu. We’ll structure a discussion that will be open and wide-ranging from your questions.

Full description and question submission information here:
http://chimprawk.blogspot.com/2006/09/invitation-discussion-with-danah-boyd.html