yeah, that's one of the best messaging apps I've tried. It has some simple but great functions, like pin message, group/channel system. However, there is one thing I would add - group calls
Yes, and not only in personal life. It is our main messaging tool at work. All in all I can say that it is an amazing instrument with great set of tools
I've never used it because, as far as I know, it doesn't offer anything particularly interesting compared to other traditional messaging systems. Or at least, it's not useful for me. 99.9% of my contacts use WhatsApp to communicate, and I prefer to avoid managing communications with too many different tools.