Somewhere I read : Younglings these days use twitter and snapchat for daily life events and reserve Facebook for bigger in-frequent events (birthday, get-together, trip etc)

That's about how it goes, at least in high school and college age people: Snapchat all the time, twitter when bored, insta scrolling all the time, post every few days or week, and Facebook for the big things.

Personally I get on Facebook twice per year, once on my birthday and once before summer to tell the world where I'm working.

That's about how it goes, then every once in awhile a new app will come up like house party recently, and everyone will jump on for a month or so then go back.

Which I find funny as hell that people don't just use sms, at least in the US most cell plans are now unlimited text (not including pictures). I never quite got the point of whatsapp or other text message alternates in the US... especially when they (many) don't have a website that can be used from the desktop.

I've been using Facebook messenger since high school in 2007 when unlimited SMS was a luxury only enjoyed by a couple of rich kids.

I don't see any point in switching to SMS now, especially when so many of my friends live in different countries.

Three reasons that spring to mind for me are encryption, rich content at no additional cost (videos+images) and the ability to know whether a message was actually sent/received

Snapchat

Can you send text on snapchat without an image? I'm asking what do they use for one on one text communication.

Yes, though I'd assumed whatsapp was the answer for messaging.