Send a Yo! from Windows Phone 8.1

gistfile1.cs

static async Task<bool> Yo()
{ 
    using (var client = new HttpClient())
    using (var mfdc = new MultipartFormDataContent())
    {
        mfdc.Add(new StringContent("YOUR_API_TOKEN"), name: "api_token");
        var response = await client.PostAsync("http://api.justyo.co/yoall/", mfdc);
        return response.IsSuccessStatusCode;
    }
}