Go balls out and leak them through a facebook fan page in an iframe tab and gateway, and make people fill out a CPA form to see if they are on it. (especially if it is really nothing special, like an old security leak release). You might even then be able to get away with making it into a facebook security application. You could promote it through videos, email, or etc. etc.
If that's too extreme, you could do it through a blog, but the authority of having an actual FB url to promote as such a thing could really help, especially if you can create urgency to take action in you promotion.
PM me if you want help. A little more info on the origin of the list might be helpful. The facebook technicalities are not a problem.