We have to implement group addressing capabilities for MMS, these lookups will likely need to search and filter (hence my original naming) by arbitrary fields throughout the contact (ie, not limited to 'tel', 'givenName' and 'familyName').

For example, if we want to send an MMS by "Favorites"...

```js
var filter;
// some check box is checked indicating a "favorites" lookup is desired
if ( favorites ) {
  filter = {
    filterBy: ['category'],
    filterOp: 'contains',
    filterValue: 'favorites'
  };
} 

...


Contacts.filterBy(filter, function() { ... });
```