Many people here, not pilots I may add, think that the priority of emergency procedures in an airliner is to keep people on an internet board informed as soon as possible. The number one priority of the aircraft design, the procedures design and the crew dealing with the emergency is to AVOID a crash. Leaving an information trail is not a priority, that is what the CVR and data recorders are for. When you hit a patch of ice in your car what do you do? Call An ambulance as the car is still moving? Start filming on you mobile? No, you try and drive out of it. Only when you have stopped and assesed if there are any injuries you call an ambulance and only when the ambulance has taken the injured away you take photos for your insurance claim.
Aircraft are not designed by idiots,;beleive it or not they are designed, like all machines with certain compromises, by people that know their stuff.
We will find out what happened here and we will change whatever needs changing to avoid a re-occurrence. Real time sattelite data downlink, not needed. It would not have ovoided the crash and the data will become available when the boxes are found. Calling ATC? At the bottom of list of priorities when your AC is out of control. What can they do to help? Fly the AC for you?