Unless something big international happens, I don’t see a crash coming, China seems to have figured out their conundrum.
Nothing to do with the Chinese or Russians, everything to do with stupid valuations for firms that have little revenue other than ads. Someone has to have real product to advertise, otherwise it’s a giant Ponzi scheme.
I’m less worried about Google that has pay-to-play services and is diversifying than firms that make apps, social networks, or “cloud” services that are subject to fad and popular whim.