Reddit is on path to do same. If reddit ever kills old.reddit, exodus will happen.
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But seriously, a designer should be thinking about the consumption/participation model as opposed to just the eyeballs/adwords-please-kill-me-now model...
The consumption and participation of a site is direct to the UX - and when DIGG basically made it a 100% consumption push, while also making participation weird/hard/less-desirable, that shit was dead.
Reddit is becoming a weird corporate bot colony and they are actively killing their UX.