From their website:
A couple years ago, we put up a blog post on the Union Square Ventures weblog and said that we wanted to hire an analyst. The deal was simple – no phone calls, no resumes, no emails – just a link to your web presence. We hired Andrew as a result of that effort and it was a great fit for everyone.
More at: http://avc.blogs.com/a_vc/2008/02/we-are-looking.html