Yeah sorry, but I would never trust Facebook with anything private. One example: I used lists for years, selectively shared data with different people. One day Facebook gets Google+ envy and now the names of the lists I shared with is public. Imagine all the people with lists labelled "hot girls" or similar? An absolute violation of privacy.

There was the recent bug that allowed viewing of personal photos via the report dialog. There have been problems with application tokens allowing data to be compromised. And Facebook has a history of resetting privacy settings when it suits them.

How about when smart lists came out? I already had a Family list, so I followed the instructions and merged it with the new smart list. Then I found out that adding people to that smart list sent them a request to confirm family relationship. So I had to create a new list (I appended a dash) and move everyone to that. The thousands of posts I'd tagged hiding or showing family were now visible or hidden incorrectly, and I just about killed my account in despair.

If you're smart enough to work at Facebook, you should be smart enough not to trust your data to that company.

Sorry for ranting. I'm just incredulous at the whole idea.