Twitter API application-only authentication (with TweetSharp)

Question

I am trying to retrieve public tweets from a server-side application, using application-only authentication (no user context).

The following code works fine:

var service = new TwitterService("<consumer key>", "<consumer secret>");
service.AuthenticateWith("<access token>", "<access token secret>"); 

var options = new ListTweetsOnUserTimelineOptions { ScreenName = "billgates" };

foreach (var tweet in service.ListTweetsOnUserTimeline(options))
    Console.WriteLine(tweet.Text);

However I gather from this diagram that it shouldn't be necessary to provide the access token/secret:

However when I remove the call to AuthenticateWith, ListTweetsOnUserTimeline returns null.

It is a limitation of the library, if not, how can I do it?

EDIT

Aas far as I can tell, this calls the GET statuses/user_timeline method that should support application-only authentication, as per the documentation:

API methods that support this form of authentication will contain two rate limits in their documentation, one that is per user (for application-user authentication) and the other is per app (for this form of application-only authentication)

The GET statuses/user_timeline method has these 2 limits shown in its documentation.

Answer 1

I think this in not a limitation of the library, but limitation of the Twitter API.

As far as I know, the ListTweetsOnUserTimeline() method uses statuses/user_timeline API call.

GET statuses/user_timeline

As you can see, this call requires authentication.

You can try to use the Streaming API for getting statuses. I can't help you here since I have only experience with user streams, not public.

Public streams

Besides, the TweetSharp has some problems with streams, I had to switch to Linq2Twitter library.