Except that it's where the people that I would choose to socialize are. My twitter social graph is has nearly no overlap with my FB graph. For me twitter is mostly writers/literary types, FB is mostly people I know in real life (although most of my interaction on FB has been with interest-based communities for which no analogue exists outside of FB).

That said, I'm doing a social media fast for Lent. It's entirely possible that when Easter comes I might not go back to either Twitter or Facebook.

Comparing not using FB to complete social and sexual abstinence is quite absurd indeed; like an alcoholic who knows its bad for them but doesn't want to stop going to bars and clubs because they think that's the only way they can socialize and find sexual partners.

I deleted my Facebook account some years ago. Even when I had one, most of my friends used it as a micro blog, image host, or free ad platform (e.g. "network marketing"), and the amount of meaningful socializing was slim to none.

Most of my socializing has been and continues to be done in person, over text, or over email. I do miss out on updates from distant family and friends, but the interaction on Facebook was always shallow anyway, so I don't feel like I'm missing much.

What? Each slack workspace is entirely different. You can't just add someone on Slack!

"Hey friend, I'm getting off Facebook, What's a Slack workspace you're in? I'll send you messages that way .."

...you delete your facebook and never talk to this friend ever again.

It's not that there aren't alternatives. It's that people don't use them. It's not like back when everyone had AIM, Yahoo and MSN and you could add people on all three and group them together in Audium/Pidgin/Trillian. Facebook has literally bought most of the competitors (Instagram, WhatsApp, etc.)