In other words, if you work for AP, you're never off duty.
I've got some sympathy for the company here: how would we react if, for example, Nick Robinson posted on his Facebook page, 'Ha ha Milibandz u SUK!'? It would compromise both him and his employer. Media outlets like tv news providers and wire services have an 'impartiality' obligation. As an employee you're made very much aware of that until eventually it becomes part of your professional ethos. Any written (let alone published) document that is immediately traceable to you ought to be composed with your 'professional' head on.
I would extend this advice to anyone who has professional responsibilities — teachers, judges, managers, bishops, whoever.
As for AP's snooping, well, have they nothing better to do?