Welcome!
I think it is a huge improvement over Facebook, it is much easier finding articles and sharing knowledge with other instructors in this format.
I would think it is 620 or something, there were a good deal Udemy employees on the platform before it was open.
You can see the # in your profile URL https://community.udemy.com/t5/user/viewprofilepage/user-id/XXXXXX <-- that is your ID
Thor Pedersen - IT , Project Management, and Cyber Security trainer
