I have been using relational databases for some time and have recently come across another database: an object database. One of the products built around this idea had a description: a scalable "post-relational" database with a multidimensional data and application server for distributed web applications.
This makes me wonder when should I use such a database? I mean, Facebook should use MySQL, and everything seems to be in order, and this can be seen as a large-scale distributed web application. The same goes for some other web applications such as Twitter and Orkut. Given that this is so, when should I use the Object database?
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