Twitter proved good enough in allowing people to make statements and build public discussions so it is successful. Internet is a great opportunity that breaks all barriers for utilities. If you are good enough at doing something just do it online and succeed.
You must own a domain of yours to own your online success like twitter.com or facebook.com have. Their users with millions of followings also do not own their success. If you do not own the domain, you do not own your success. Therefore working on your domain is advisable.