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-468
HTTP 200 OK
Allow: GET, HEAD, OPTIONS
Cache-Control: max-age=0, no-cache, no-store, must-revalidate
Content-Type: application/json
Expires: Mon, 25 Jan 2021 16:50:45 GMT
Vary: Accept

{
    "count": 50,
    "next": null,
    "previous": null,
    "results": [
        {
            "source": "direct-sharing-468",
            "name": "OPEN",
            "usernames": [
                "gedankenstuecke",
                "stephenbrad",
                "246PWD",
                "alternateal",
                "dramageek",
                "bonbon",
                "sthacher",
                "gerarddwan",
                "Lilly",
                "zreptil",
                "MarcelZ",
                "cascer1",
                "clehner1961",
                "swissalpine",
                "Unidragon",
                "AndyS",
                "Shaggydog",
                "TeleRiddler",
                "steffen",
                "Zuckerschule",
                "DonutMaster",
                "Jarvis532",
                "friendocrino",
                "louisF",
                "k1232",
                "Gosee1960",
                "itsn0tm3",
                "Susanne",
                "markvader",
                "Dawnee",
                "cristinav",
                "Ludovik95",
                "No_one_20",
                "Shane",
                "Seveboru",
                "dlvoy",
                "chrisgruebl",
                "RalfCGM",
                "Lew_Easy",
                "Pumpit",
                "guydavies",
                "Rachel162",
                "reimarmetzen",
                "Lispro",
                "Galloglass",
                "RandomLuck",
                "MarkOldham",
                "Rainforest",
                "CGinDC",
                "jonprogers",
                "aholareijo",
                "ShivGaff",
                "kerray",
                "Alice",
                "lopep",
                "ansku",
                "avitabile",
                "mohuma",
                "Cleo2014",
                "anirudhreddy28",
                "D_Haak",
                "HermannW",
                "Tanja3981",
                "Dave2526",
                "Kz9Fl",
                "thseliger",
                "28021990",
                "Heiner1",
                "Tycho",
                "MelC",
                "an_di",
                "hise002",
                "DarthDadT1D",
                "Chocoholic",
                "Maren",
                "cjlogan",
                "Atze6r",
                "kiprada",
                "lisa675",
                "Dragan",
                "Waldkauz",
                "PeterLeimbach",
                "Jumalakarhu",
                "Unterstark",
                "Maxel1530",
                "paulplant",
                "dascheberg",
                "MTR",
                "winni67",
                "elliroux",
                "Binja65",
                "Stuggesjoerd",
                "DutchT1d",
                "PassatQueen",
                "js",
                "Ezrany",
                "Minouvanos",
                "PeCa",
                "TRex",
                "random",
                "Pipsko",
                "theokaza",
                "sayno2day",
                "Generic",
                "Barjo",
                "lifeexcellence",
                "jimche4",
                "honing",
                "j2hanson",
                "cassidyjaye",
                "Nupur",
                "Mangereid",
                "LS"
            ]
        }
    ]
}