As this is a question about the site I'll move it to the site and forum feedback area.
Well the first reason we don't have a whatsap group is that I don't believe any of the admins use whatsp, or at least I don't.
The second reason is a bit more complex.
This forum is attached to the website and it is what we manage.
If I understand whatsap correctly it's pretty much another social media system like reddit, and would be basically like another forum which we already have and likely wouldn't have time to moderate even if we had one.
The same goes for why we don't have an audiogames.net chatroom, im group, myspace linkedin, etc etc with all those other social media encarnations that are basically glorified chat programs.
We do have facebook and twitter feeds, but they are more a matter of dispensing news than anything else, indeed I believe they just replicate the news that is posted to the front of site and so aren't really intended for discussion.
Lastly as to other languages, well again English is the only common language among all the admins so it is the only language we can moderate in which is the same reason we don't have forums in languages other than English.
I hope this answers the question.
With our dreaming and singing, Ceaseless and sorrowless we! The glory about us clinging Of the glorious futures we see,
Our souls with high music ringing; O men! It must ever be
That we dwell in our dreaming and singing, A little apart from ye. (Arthur O'Shaughnessy 1873.)