I found it very useful about 8 years ago, before smartphones with messaging apps became so ubiquitous. I lived in France for a bit, then Ireland a little later and had a long distance relationship with a girl in Turkey. Using Skype to send the SMSes to her phone was considerably cheaper. Once I moved to Ireland, I got a cellphone contract which included "free skype to skype" and I could call her for free, just using my Skype credit. It was just a cheap feature phone, but the phone software somehow instructed the cellphone network to "call me" and then route the call over Skype from their network.
I haven't needed Skype credit in quite while now, I met a different girl ultimately who was local, but still have a little credit on my account.
These days I use iMessage and WhatsApp.
And other stuff of course. It of course helped us day to day solving problems, but I imagine that it also helped all of us more readily absorb information at conferences too.
For example, a warning about a self signed cert on a website that I wouldn't mind using over plain text: that still more secure than plain old http, so I click off the warning.
I have bolded the part that is factually wrong, unless they are actually checking self-signed certificate thumbprints, the unverified certificate is no more secure (or at best, only negligibly more) than plain text HTTP.
Consider the postage stamp: its usefulness consists in the ability to stick to one thing till it gets there. -- Josh Billings