So, your app is unlikely to be as popular as foursquare, for instance, at least right now, and they seem fine and happy with MongoDB. You might recall the issues they had with it a while back, but those have all been fixed as far as I'm aware. 10gen is really quite impressive when it comes to support, etc.
But, the real question is, why do you think a SQL database will not be scalable to begin with? I'm going to say that well over 75% of the top sites, use a SQL database.
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So, your app is unlikely to be as popular as foursquare, for instance, at least right now, and they seem fine and happy with MongoDB. You might recall the issues they had with it a while back, but those have all been fixed as far as I'm aware. 10gen is really quite impressive when it comes to support, etc.
But, the real question is, why do you think a SQL database will not be scalable to begin with? I'm going to say that well over 75% of the top sites, use a SQL database.