Personally I'm a huge fan. Instagram has never been for me. But it appears to be becoming a relatively popular IM tool. I thought I was going to have to install it on my phone at some point to communicate with friends but this lets me stick with the same one facebook app that I have been living with for years.

I can't wait until I can drop WhatsApp too.

I mean ideally people would start using something open like Matrix or even XMPP but I'll still take wins when I can get them. The less separate networks the better as far as I am concerned.