Marketing to Email Addresses Collected Using Facebook Login?

So some background -

Our CRM contacts are built from source data from an app registration.

We have the ability for users to register to our app via Facebook. When users register through facebook we receive their contact details and also their email address but no facility for them to 'tick a box' to receive marketing material.

Has anyone else been in a similar situation and how have you engaged these users to add to your Click Dimensions sends?.

Any feedback would be helpful.


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