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Doesn't eBay use MongoDB at scale (ref: http://www.slideshare.net/jaykumarpatel/cassandra-data-model...).

Slide 4 shows eBay's MongoDB cluster size: Hundreds of nodes, > 50TB, > 2 billion ops/day

thanks for the link, I wonder how they use it? The companies I've been working with have made the mistake of using Mongo as their sole data store for everything, rather than for one specific purpose.

Media metadata is one use case:

http://www.mongodb.com/presentations/storing-ebays-media-met...

Here's another deck from 2012: http://www.slideshare.net/mongodb/mongodb-at-ebay

sounds like more direct key lookups. I can definitely believe mongo is suited for that particular use case, but I'm super sceptical about it being used as a general data store.

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