Return an array where each entry is an object with this form:

{ source: "fitbit", name: "Fitbit", usernames: ["beau", "madprime"] }

GET /api/public-data/members-by-source/?source=direct-sharing-149
HTTP 200 OK
Allow: GET, HEAD, OPTIONS
Cache-Control: max-age=0, no-cache, no-store, must-revalidate
Content-Type: application/json
Expires: Mon, 18 Oct 2021 18:00:15 GMT
Vary: Accept

{
    "count": 53,
    "next": null,
    "previous": null,
    "results": [
        {
            "source": "direct-sharing-149",
            "name": "RescueTime connection",
            "usernames": [
                "miguelrochefort",
                "gedankenstuecke",
                "stephenbrad",
                "thefedoration",
                "amilcar",
                "Oluwande",
                "svemagie",
                "calkibet",
                "alexbfree",
                "cubicgarden",
                "nithou",
                "miciahmae",
                "stephthegeek",
                "beau",
                "Fortin",
                "gsdcomo",
                "cascrogg",
                "justinlawler",
                "carlremi",
                "douglasgoodwin",
                "sprague",
                "johnthomaskennedy",
                "kasan",
                "OGolly",
                "saw2112",
                "Ascendant",
                "dhanushram",
                "ouzor",
                "nikolay",
                "mdulaney",
                "dhanush_ram",
                "jmrphy",
                "cloidl",
                "DG",
                "openhumans",
                "monacate",
                "katielorrie",
                "bmander",
                "artemis4000",
                "reblaw",
                "geoffrothman",
                "Konvpolto",
                "Tornado14",
                "katewac",
                "ArloJamesBarnes",
                "oguzhanogreden",
                "growwithlogan",
                "flamenquim",
                "Geekfish",
                "yeltsinxyz",
                "TDYLN",
                "Iain",
                "paula",
                "benevides",
                "dmlh",
                "jimzim",
                "Federica__",
                "austospumanto",
                "Nzo",
                "juicyj",
                "c3n47ur",
                "ldorigo",
                "participant1",
                "Avangardas",
                "vytenisd",
                "KaleyWhite",
                "Alex0007",
                "bjornh",
                "Zodios"
            ]
        }
    ]
}