Telegram is the best place I think. It has all the coins and the communities on there. People are joining every day like crazy. I also feel like Twitter is a place where announcements are first made. It seems like it is said there and then on all other platforms coins are on.
I completely forgot about twitter and telegram!
yes indeed bitcointalk is good place talking about cryptocurrency. twitter indeed good place cause many of dev put their news in there. telegram is good too cause we cand directly chat with the important person from developer.