There are a couple of discussion forums: The Artificial Intelligence Forum, which is a popular forum with a lot of discussions ranging from simple questions about AI to dedicated questions for some particular problem being faced while doing some research.
Then there is something called AI Dream where the members take part in projects and experiments and their results and findings are discussed.
There is a Facebook group for artificial intelligence and deep learning. I am attaching the link here to Artificial Intelligence and Deep Learning.
There are loads of such forums available, you can always google them up and check out which suits your needs better. Of course, if you take up a course that is delivered online, there will be a forum where you can interact with students and professors from all over.