A new report by On Device Research hammers in the challenge Facebook is facing right now. Confirming other reports on the topic, ODR finds that Facebook usage is heaviest among users aged 51 years and older. In sharp contrast, WhatsApp usage peaks among the 25-39 year olds. In the 16-24 year old bracket, the percentage of Americans using Facebook on a weekly basis outpaces WhatsApp users by the slimmest of margins at 40% to 37%. But the most interesting finding in the ODR report concerns the surprisingly small overlap between Facebook and WhatsApp users. Only 24% of American smartphone owners use both services. 45% use only Facebook and 31% use only WhatsApp. This would seem to indicate that most WhatsApp users have tuned out Facebook. Messaging apps really are stealing consumers from