As I discuss on Quora, there are significant securities-law issues that must be addressed (see <a href="http://bit.ly/egcdr5" rel="nofollow">http://bit.ly/egcdr5</a>). My advice to all startups is to be very careful with these kinds of sites. I have gotten calls from several entrepreneurs who have run into problems with securities regulators. Thanks, Scott (@ScottEdWalker)