Just eliminate the various liability shields that have been enacted for third-party content. In certain areas (e.g. the personals website crackdown) we are moving in this direction already.

If you make a search engine vulnerable to a libel lawsuit because, for example, their search results make it look like Joe So-and-So was arrested for DUI (when it was actually Joe So-and-Sew or some such thing), they'll just stop indexing that stuff entirely.

Best to avoid creating new laws where old legal concepts will work fine.