Facebook executives are preparing for a ‘privacy summit’ to discuss the site’s controversial new default privacy settings (which do little to protect users’ privacy). But in a world of over-sharing online, does privacy even matter anymore? And have our notions of public and private changed so dramatically that we couldn’t reverse things if we wanted to?

Talk to someone sharing their information. Take part in our "TMI" experiment!

Are we sharing too much information on Twitter and Facebook? We're exploring the benefits and the downsides of sharing our personal lives making our private lives public. Help us in an experiment!

Seek out a stranger that you see sharing information on the internet — on Twitter, Facebook, FourSquare — anyone who catches your interest. Don't go stalking though, just reach out and ask them one question for us: What benefit does he or she get from sharing personal information publicly? Tell us what happens and we'll talk about it on the air.