Can I, simultaneously, run two instances of the Facebook app?

Can I, simultaneously, run two instances of the same Facebook app?
(which is installed once in the system)
I want to be active on two accounts (I also have iOS and Windows Phone devices if their support for multiple instances of an app is better than Android's.
But my Android phone is my main phone, hence I prefer an Android solution)
Also can I get parallel notifications from both the accounts (I don't need any chat messages, just the notifications from a specific Facebook group on my second account).