I will use the chat on occasion. I often don’t have the time to sit and get into conversations. Yes, it goes by fast at times, and is best to use a device with a keyboard rather than a soft keyboard, because you can type faster that way.
I will also use PM on occasions. I can send more personal info than I might want to put on public chat.
Most often it is via the forums. Specific questions and specific answers, and the answers can sometimes be a long time after the question.