I can relate to those that have stated they have no desire to use it.
To me it is a vital portal.
I understand the limitations it can force on work etc. I have no workplace in my case, no outlet in that realm for social interaction to begin with.
It's a means to an end for me.
If I actually had work, could work, I'd likely not need Facebook.
As for fad, that is a hard call. I don't think the concept of internet social aspect is going to ever go away, but, specific uses do seem to last for a while to be out done by some new method only just made possible by superior programming or technology.
In the 90s ICQ ruled it seemed. But it didn't last past 2000. In 2000 the web exploded and just texting through something like ICQ was just not enough. Web pages were the thing. But I think web pages have toned down a lot. I discovered forums in 2000, and while they have not died down, I have found that most age and lose their sparkle once they mature.
Nothing is forever on the net though. Downloading was 'the thing' in the years 2000-2005, but superior choices seem to be making downloading no longer as vital. I downloaded a massive sum of video in 2000-2005, but today I'd rather pay 8 bucks and let Netflix do all the work of storing the stuff. I used to need newsgroups for anime, but with Crunchyroll, well its pointless to fuss over downloading when they have more than I can watch now.
The key to the whole piracy thing, is find a way to make joe nobody uninterested in getting the content from mr nasty uploader.
I can get games adequately legit now, I can get my movies legit now. But Hollywood continues to fume because I suppose they are just that greedy.
I ditched cable as it was a poor use of money.
But I find I can't completely severe my means of going online.
I wouldn't mind it so much if I had to.
But it is a good portal to efficient means of buying things.
My phone is an internet phone. I pay a measly 99 cents a month for my service. Of course I don't have a cell phone. I can use stuff like Skype easy enough.
I am sure something will eventually replace Facebook.
I think a lot of things are slowly trying to merge.
It's like how all the stores want to be grocery, and hardware and clothing and electronics and provide a place to eat. We just got a Target in town. But the thing is, they do it all, but they don't do it better than specifically focused retail.
I think that is my main beef with Facebook. They try too hard to do too much.
I suppose Facebook is only working, as it is making someone a lot of money.
It could have been Google, or Wiki, or a Blog program that morphed into what Facebook has become.
What is funny, is I don't use my face on Facebook.
And my name, well comically, both my wife and myself, we have typed in our name initial surname, and found scores of us

I am not sure you need to worry about privacy, but rather mistaken identity.