I wonder how these hard to measure metrics really translate into more sales, more cash flow, especially when majority of Snapchat users are creditcard less adol

I wonder how these hard to measure metrics really translate into more sales, more cash flow, especially when majority of Snapchat users are creditcard less adolescents and starving undergraduates. Maybe as Google is attempting to cover all aspects of search, Facebook is doing the same when it comes to social networking, but unlike search which has a very narrow definition of expected outcome and objective that translates into shifting the user's attention to relevant ads (I google to get specific information, might be interested in relevant ads that provide more of it), social networking is a lot more uncertain, lot of more elusive goals (I chat on fb or look up someone on FB for laying, friendship) that is resistant to anything that will take the attention away from the social engagement...in large the giant user base is useless while the cost of maintaining such large infrastructure behind it outgrows the actual revenues....it makes very little sense as to why FB would go out of their way to support social networks that serves no other purpose than use up their resources but shareholders seem to think that "there's no way they will screw up monetization, it will happen eventually and match Google to justify the inflated valuation one day" with little analysis on cash. Unless the rules of business have changed that they can purely live on investors hopes of a rosy future rather than net positive cash flow indicate a bubble.