I need an advice please. I am starting to build a social networking site using drupal Commons. A friend told me that I should have four different databases to store: 1: user registration information, 2: users location and 3: their food preferences and the 4th one would store everything else, like modules, content types, views etc..
The reason why he would like to do it that way is to have a easier way to find that data in case the site gets say 50.000 thousands register users.
I am not pretty sure if I should store everything in just one database or follow my friend advice. Could you please give me some insights?