For Twitter

int followers = service.Users.GetUser("abjerner").FollowersCount;

For YouTube

Version 2 of the Google API allows you to get the subscriber count for a given user, but that version was deprecated in the spring.

Version 3 doesn't work with users, but channels instead. Considering that you have an active instance of GoogleService and sufficient permissions to access the YouTube API, you can do the following:

NameValueCollection query = new NameValueCollection();
query.Add("part", "id,snippet");
query.Add("forUsername", "Battlefield");
query.Add("access_token", service.Client.AccessToken);

string response = SocialUtils.DoHttpGetRequestAndGetBodyAsString("https://www.googleapis.com/youtube/v3/channels", query);

dynamic json = JsonConvert.DeserializeObject<JObject>(response);

int subscriberCount = json.items[0].statistics.subscriberCount;

It is only a quick snippet - I will add better support for it later in Skybrud.Social. The snippet also lacks error handling , and it is only tested with a user that has a single channel.

For Facebook

As I wrote earlier, this seems to be deprecated as of v2.0, but it still works. You can exchange me with a valid identifier.

string res = SocialUtils.DoHttpGetRequestAndGetBodyAsString("https://graph.facebook.com/v2.2/me/subscribers?access_token=" + service.Client.AccessToken);

dynamic json = JsonConvert.DeserializeObject<JObject>(res);

int subscriberCount = json.summary.total_count;