In the obvious way for some people? It's disingenuous to pretend that opting out of FB doesn't have negative social consequences for some (many?) people, and dismissing their concerns probably isn't a good way to change anyone's mind.
Our 7 year old goes to an arts and crafts centre, in the aftermath of the furore over the WhatsApp Terms of Service update the organizers changed their contact details to suggesting reaching them via Signal instead. So we switched. Job done.
My social life actually got better after dropping social media simply because I'm spending less time scrolling in front of a screen.
That's a very binary view of the world that I don't share. But that's not a topic I want to get into.
Can you keep in touch with a certain group of friends through non-social media platforms? Absolutely. I do it daily, but that's not the point.
The point is that staying away from these social media platforms reduces your ability to have a social life. It's quite like saying that you decrease your chances of finding work without a driving license or cellphone number.
I could probably get away without social media today (modulo telegram/whatsapp). But at what point would I surrender? Most people of my generation use it, and it looks like newer generations will have even higher usages.
In what way? Social lives existed before 2008 when FB went mainstream. I don't have a FB anymore, and I still text my friends for get-togethers.