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-133
HTTP 200 OK
Allow: GET, HEAD, OPTIONS
Cache-Control: max-age=0, no-cache, no-store, must-revalidate
Content-Type: application/json
Expires: Thu, 25 Apr 2019 17:52:51 GMT
Vary: Accept

{
    "count": 35,
    "next": null,
    "previous": null,
    "results": [
        {
            "source": "direct-sharing-133",
            "name": "Data Selfies",
            "usernames": [
                "rjboyd",
                "wctopp",
                "johnthomaskennedy",
                "margaretannf",
                "mheffler",
                "jbronkal",
                "bashcraft",
                "Natejka7273",
                "govern27218",
                "huA9A1B6",
                "MelissaMaps",
                "sbtoloc",
                "JoshuaJBerk",
                "bewest",
                "Rodrigues",
                "BOOKHUGGER",
                "thelizarmy",
                "lludo",
                "Maggan",
                "weijian3",
                "zvanstanley",
                "jsalvi",
                "kamokittie",
                "Komzpa",
                "kevinduffy",
                "stephenbrad",
                "annamabo",
                "testingthingsABC",
                "mcfame216",
                "stst_808",
                "devils_marbles",
                "cenya",
                "Kazuya_Onuki",
                "Stavlor",
                "turtleclan1978",
                "Fleeman",
                "tashagill",
                "ayla87",
                "obonillo",
                "trishfleeman",
                "dylantaylor",
                "urquizalu",
                "sylko",
                "DemonRaven",
                "Bron_6",
                "roxybike80",
                "kellijeancoq",
                "shubhangi_chauhan",
                "frizzlediam",
                "TilleyFreemanGibbs84",
                "Geatie1963",
                "Rachel",
                "navyjoe93236",
                "yK2UoKi_Zs",
                "Zii",
                "jimrandomh",
                "bjbreitling",
                "Lovelee",
                "Matilda444",
                "Explore360",
                "test_user",
                "bestgrad1",
                "sprague",
                "Pancreas2021",
                "Fortin",
                "seva_lapsha",
                "vmaxuploads",
                "padams89",
                "linseya23",
                "swede_male",
                "trianglegrrl",
                "brianpardy",
                "KirkMMaxey",
                "trog2",
                "CGould1972",
                "Dyfflinviking",
                "mvr33",
                "Matthew_McAteer_1",
                "gedankenstuecke",
                "beau",
                "jasonbobe",
                "Abe",
                "eramirez",
                "vmerker7",
                "gsdcomo",
                "Ysearcher",
                "GlobugTX",
                "blackbearnh",
                "ejain",
                "Hexaped",
                "yp318041",
                "stevenkeating",
                "katja",
                "srb115",
                "UO_norwegian",
                "ericjamesu",
                "benc",
                "RemyWay",
                "jtadams41",
                "Otter9",
                "talex",
                "nobismRogierKoning",
                "zreptil",
                "theflyingfraction",
                "cparker354",
                "Sadike25",
                "Shaoobie",
                "AndyS",
                "assimowitsch",
                "Agaricus",
                "openaps000",
                "Bobbles",
                "AbootBrutus",
                "yeltsinxyz",
                "madprime",
                "shibda",
                "mozambiquepaul",
                "earthseed",
                "oguzhanogreden",
                "mdulaney",
                "savagela",
                "Elcharles89",
                "saw2112",
                "criniss",
                "pdehaye",
                "carptj",
                "quizzmaster",
                "fabianweiss"
            ]
        }
    ]
}