It seems that Abel was part of Patch and Tim Armstrong is CEO of AOL. This second call was from some time last year and not related to the OPs link other than it's the same set of companies, and another dubious action made on a conference call.
I don't think anyone is debating whether taking a photo during a serious meeting is a good idea
It's wrong to unnecessarily fire someone in front of their colleagues. It destroys morale and it's essentially a form of public humiliation. A better response would have been to ask to put the camera away and remind people it's a serious meeting.