HOW can those tweets be separated from his role?
Sorry I have sympathy for people being hounded to quit because they have made a silly comment on twitter without knowing better. But Adam Orth should have known better (I assume he does now or maybe he is just bewildered). Tech company execs should realise that what they post is closely examined in the context of their role by the community they cultivate to promote their goods.
Remember Steve Jobs on the iPhone 4 antenna issue? He only got away with that because of who he was but there were a lot of people thinking what IS he doing getting involved.