The PR guru and longtime correspondent Fraser Seitel has a good piece today at Ragan.com self-explanatorily titled, "Like your PR job? Then keep your Twitter trap shut."
Lamenting the fate of several PR pros who have recently Tweeted their jobs away, Sad & Wise Seitel elaborates:
"… you want to keep your job, especially in the practice of public relations, then you must subordinate your right to tweet or blog to the interests of your client. If what you would like to tweet or blog won’t reflect well on your client, then you simply shouldn’t do it—unless, of course, you are willing to part with that portion of your income."
Impossible to disagree with that, but another obvious point goes unmade: The foolproof way to avoid saying something that would cross your client is to find clients whose interests generally don't disagree with your beliefs and whose brand matches your communication style.