Why do I need to connect my social accounts to edit contact records?
When you edit and update a contact record such as changing a phone number, Nimble verifies all the data in the record - including running checks in your social networks to verify that the social profiles connected to the contact are valid.
Currently, you need to connect your Twitter and LinkedIn accounts to Nimble in order to edit records (that have Twitter/LinkedIn profiles connected).
Facebook and Google+ do not require the same procedure, so you can leave your those accounts disconnected and still be able to edit records (even if they have Facebook/Google+ profiles connected)