How will anyone be elected president in 20 years time?

With everyone sharing everything about themselves, bad habits and all, on Facebook, Flickr, Twitter, etc., how will anyone be electable in 20 years time? My hope is that the electorate will understand that everyone did stupid things when they were young. Perhaps the wide availability of the evidence will make people so sick of hearing about trivial indiscretions that there will be a backlash against reporting them and we can concentrate on real issues. Eh, it'll never happen ...