I'm curious, could these sort of statements made by a CEO in regards to a former employee be crossing the line into defamation? As in, if Pierce is looking for a job in the future and this is what a potential employer finds...
Could well. I've heard a lot of larger companies have a policy of only providing references of the form "X worked here from Y to Z" for that exact reason.
I also agree - but then he said something potentially defamatory :-)
However, I think if an employee looks up Shay's details, they will first find his op-ed calling Zynga "evil". I guess if they are concerned about the OMGPOP tweet, then they will be REALLY worried about the op-ed!