[qorrect]

> Instagram is basically the only platform you can contact everyone you known on

Forgive my ignorance but I thought Instagram was just a place to upload random photos.

[orestarod]

It also has a chat, and for many it has become the main channel to stay in touch with each other. I'm not sure why either, I guess it's because they spend more time in the app than other messengers, so they might as well chat on it too.

[Closi]

There is a whole messenger client in there - "Swapping instas" is the new "can I get your phone number" in some circles.