But the prices keep on going up.
Bubble doesn't mean "pops and value goes to zero". It means something more like overvalued asset class that can lose value rapidly. If there is intrinsic value, it won't got to zero. Nobody imagines that of a real estate market outside scenarios that include major wars, etc.
House prices with any sort of scarcity are largely driven by peoples ability to pay (i.e. finance the debt).
I'm not really stating an opinion, just an observation that tonnes of social media companies died until the current 'in' ones adopted advertising and (so far, and for longer already) lasted.
I was 1000% on team facebook/snap/twitter is a bubble.