Yep, used to have FB when I was younger and realized then it was not a particularly good media for information dissemination. Not particularly interested in the comings and goings of others - let alone all the trials and tribulations of their day to day lives (hmmm, read one once - which is the reason that I stopped using it - where the person said "the person on the train in front of me is talking so loud on their phone - what a
It is whatever you choose it to be mate. You can make it as private or public as you want. Me, I share family stuff with a select few, and my larger motorcycle family everything else. It doesn't really get used for anything beyond that. I used to have news feeds and a flood of information, then one day stripped the lot. It's a much better place for me now.
I also think most of the younger generation frown on facebook as a place for the older people, I know both of my kids use things like instagram etc which I don't really like. I know when I use facebook for advertising that 30-50 year old bracket easily dominates the demographic.
I think a lot of what you wrote was true for the early days of facebook. As for security, that's my sons area, being secure on the internet is a fallacy. Even with forums like this, they are generic templates and users are given a range of information. I don't know anything about this one but the one we had (a group of traders) allowed us to see each users isp, their ip address and the name of the website they went to from our page. For me that was too much information for us to have, but it is normal in the online world.
As you know I'm a trader, the computers that keep all my important information don't have access to the internet, all data transfer is through usb. Your industry would be much the same I suspect. Share what doesn't matter, and protect what does.
Edit: Sorry just to clarify, it's not my group. I don't know the people who run it. I just mentioned it because it seems to be the largest group of Australian Indian owners and was stuck at the number 666.