Ask HN: User management for social users on a Python (ruby) Web app

Hi HNers

I am trying to build a python web app that is a fairly basic way to save articles and recipes (I know its been done a thousand times but this is just practice app building). There are tons of mechanisms to auth and get the info from say FB. How do you manage and store the information at a user level? Is there a library - I can imagine its a pretty common problem.

Alternatively is there a ruby gem that can do this in case there is nothing reusable for Python?

Thanks in advance!