public async static Task<Tweet> DeleteFavourite(this IUserSession session, Tweet tweet)
{
var parameters = new TwitterParametersCollection();
parameters.Create(id: tweet.Id);
var url = TwitterApi.Resolve("/1.1/favorites/destroy.json");
return await session.PostAsync(url, parameters)
.ContinueWith(c => c.MapToSingle<Tweet>());
}
}