En Instagram, con F12 aparece algo así :

function p(t, n, o) {
for (var a = arguments.length, i = new Array(a > 3 ? a - 3 : 0), l = 3; l < a; l++)
i[l - 3] = arguments[l];
var c = u;
if (u += 1,
typeof n != "function")
return c;
var d = (e || (e = r("JSScheduler"))).scheduleDelayedCallback_DO_NOT_USE(t, o, function() {
s.delete(c),
n.apply(void 0, i)
});
return s.set(c, d),
c
}