https://s.kaskus.id/images/2017/04/20/3279288_201704200909260348.jpg is that the right group, Private English Club ?? Yes this one! Be sure to join us! :)
It depends, i joined in several group and i don't learn much from there. I still need to learn from movies, books, youtube, google, dictionary, etc. But! i still need a place to apply my knowledge somewhere and there is when the group comes in handy. So yeah, the group and people to communicate are
People tend to comfortable with their main language, don't be confuse at it, the same condition applied to all people in the world. Chinese with Weibo, Korean with Daum, Indonesian with Kaskus etc.
Menggeleng = Head Shake Mengangguk = Nod These are gestures to express agreement and rejection, you don't really need use the words in common conversation except for describing situation like in novel.