Preferred to the system contact picker because:
1. removes "group" clutter from header, unlikely to be used much.
2. can select while searching
3. fixes unified contact problem where e.g.
If only one of your contact has a phone number, they appear disabled
when choosing to invite via messaging, even though the other linked
contact *does* have a phone number.
4. label users w/o email so it's clearer why they can't be selected
Also:
* Twitter share-image was too tall
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