Unable to install IMO.im on Nokia Lumia 900?

Hello friends.

i am having nokia lumia 900, downloaded IMO.im number of times, but again have to uninstall it.

Reason it is not working properly. Everytime i open it, it takes me to rating page and then asks for facebook login.

Please suggest what to do.

Which is the right way to install it and from where.

Thanks & Regards

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