Devil's advocate but
you can measurably tell if you are financially successful (from working hard/long hours) and our healthy fitness wise (from going to the gym/eating clean/going for a run/etc.)
you can also measurably tell if you are in a good headspace from meditation/yoga/reading
I'm the first person to poop on people who "do it for the Gram" but...
Most people I know who post about being successful are the same people who wouldn't want their image hurt by being caught in a lie.
aka... they aren't really "fronting", they are really "about it" when it comes to living a "let's talk about it" lifestyle