I have been involved with many discussions about rules for participation in virtual communities – Speaking to Me: Terms and Conditions does a great job of making fun of the kinds of “community rules” documents that result.
On a slightly serious note it does suggest some of the actual issues that may arise when increasing numbers of people blog their daily lives – eg:
6. By speaking to Tom Peyer, you grant the royalty-free, perpetual, irrevocable, nonexclusive, unrestricted worldwide license to use, reproduce, modify, adapt, publish, translate, create derivative works from, distribute, perform, and display the material (in whole or part) worldwide and/or to incorporate it in other works in any form, media, or technology now known or later developed, including in any parallel universes.