Note to Tweeters Who Hire Ghostwriters: Change Your Password

Someone who calls himself a "Social Marketing & Communications Strategist" is facing embarrassment over his Twitter account. Apparently, @Mark Davidson had hired three people to ghostwrite tweets for him, only to be exposed on his own Twitter feed. One angry former writer took advantage of Davidson's failure to change his Twitter password and kept posting after he stopped working for Davidson:

Discussion Starters:

• What are the ethical considerations of someone tweeting for someone else? Does Davidson's job influence your perspective? (On Twitter, he describes himself as "Internet sales & marketing professional. I write a lot of things to amuse myself and others. On occasion, I even have deep thoughts.")
• After this incident, Davidson (himself, apparently) posted this tweet: "WANTED: Social Media Account Ghost Writer. We've recently had an opening at http://twitter.com/#!/markdavidson. (Serious inquiries only.)" Would you apply? Why or why not?