The Wall Street Journal writers were given a newly compiled list of rules for “professional conduct,” which included a guide for use of online outlets, noting cautions for activities on social networking sites. The memo says that staffers should consult their editor before “connecting” to or “friending” any reporting contacts who may need to be treated as confidential sources, and business and pleasure should not be mixed on services like Twitter. The revised code of conduct also includes details about offline friendships, freelance work and public speaking.