It's all well and good that your high-profile execs just want that 'social publicity' and let their admins run it for them. Until their admins accept these spam-bot contacts and then wind up getting socially engineered into released important/sensitive/confidential information, like passwords.
Then what happens is you have Sony, you have Citi, and you have numerous other smaller gaffes that I don' t really need to enumerate here.
You want publicity, fine... but make it a one way road. Don't even give them the chance of spamming you. Some spam is LETHAL in the wrong hands.