How do you quantify if something is a decent product? iMessage does more than 2 billion messages per day [1]. I couldn't find FaceTime metrics but anecdotally f

How do you quantify if something is a decent product? iMessage does more than 2 billion messages per day [1]. I couldn't find FaceTime metrics but anecdotally for years I could never get my mom to use Skype but now she FaceTime's me all the time. This speaks volumes. http://bgr.com/2013/01/24/apple-imessage-growth-analysis-whatsapp-304019/ http://bgr.com/2013/01/24/apple-imessage-growth-analysis-wha...