I agree with jfarmer, this is a no-go situation. Imagine I give you all my accounts like FB and G, and then you store it in some unsecure manner and it gets hac

I agree with jfarmer, this is a no-go situation. Imagine I give you all my accounts like FB and G, and then you store it in some unsecure manner and it gets hacked... Or, what if you decide to send spam on my behalf using my accounts. These accounts are too important to take "some" startups word for it.