This enhanced fb user is used in `contact_detail.js` but I just realised we are not doing anything with it (`contact_detail.js` L223).

But, in the `Contacts` class is being used in the click handler `contactListClickHandler`, this is used in the `pick` activity. If we remove this, the pick activity coming from email may fail, since the email coming from FB is not stored in the MozContact object, so we will need to keep a track of the enhanced data (coming from Facebook).

A tricky one ;)