Just by the apps mentioned I would say Pinterest or Facebook. I know they are heavy apps as I loaded the ios versions on my iPhone them using a manager app I realised they were draining my battery so I uninstalled them. Best thing to do is uninstall all the added apps then load them in order of importance and see how you get on after each app is loaded.
If it can be returned and the 16GB purchased that would be a better move long term.
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