You might have seen the PSA in which a teenage cyber-bully reads her hateful words from the podium of a school assembly. The absurdity of the scene illustrates a disconnect that often exists between our online and offline behavior—when emboldened by the impersonal buffer of a social network, we might say or do things we never would in person. In a post at his Web Ink Now blog, David Meerman Scott encourages readers to treat social-networking sites as if they`re cocktail parties. In other word...