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What examples can you think of outside of gaming or dating that face this challenge?

Hmm.. products that have a limited number of consumable things. Maybe earlier reddit, when there wasn't many links, you could exhaust everything on there.

turntable.fm

You think so? It doesn't have a content problem (there's infinite music).

I posited that Turntable.fm failed for other reasons: http://ryanhoover.me/post/45420658844/what-killed-turntable-...

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