There are two, long-running, worldwide tango mailing lists on the Internet. They have been in operation since 1995, and anyone may subscribe to them. They are Tango-A and Tango-L. Tango-A is for announcements of major Tango events (by region), and Tango-L is for discussion about any aspect of Tango.
There are over 1000 subscribers to these lists. Tango-L discussion is often educational and can give you an idea of the wide range of opinions about such things as nuevo tango, alternative music, building communities, and other issues. However, as tango tends to attract passionate people, the discussions can also degenerate into contentious and unproductive flame wars. Caveat emptor.
Please go to Tango-L for information about these lists, how to subscribe, policies, etc.