DISQUS

I'd also be interested to know how they are doing their calculation. Are they measuring conversion per session, or are they adding up all converting sessions from a single shared link? If the latter, then the increased conversion rate might simply be a function of the wider distribution (resulting in more inbound sessions) you get when links are shared on Facebook or Twitter, which would make sense.

If sharing is a numerator and denominator feature, then that would make for a strong case for plastering share links everywhere.

In your post, you say "This morning I looked through my privacy settings and I can no longer seem to find individuals who I had set to limited profile access."

As part of the privacy changes, Facebook automatically created a new friend list for each user called "Limited Profile" and put all of the users who you set to limited profile access in this new friend list. Just go to the friends page and you should see the new friend list on the right: http://www.facebook.com/friends/.