*patient sigh*
Yes, I get that there are other forms of communication. I even use most of them. I call people on the phone. I meet them in person. I send email. Hell, I even use snail mail once in a while. I'm just saying that FB is just as valid and even useful form of communication, no more or less so than any of the ones you listed. I don't agree that FB has to be a depressing or PTSD-worsening experience, and it can even be a positive experience if you know how to filter what doesn't work for you. Any of those forms of communication require filtering - telling telemarketers to take you off their list, filtering spam, sorting your junk mail from your real mail. A positive FB experience requires more filtering, but I'm here to say that it can be had. For example - I have come into contact with quite a number of healing arts practitioners in an organic, unhurried fashion, and advanced my own treatment of my PTSD because of it. There's a number of opportunities I got, not just work-related, but life-related, that I probably would have missed out on had I exiled myself. I've even made real-life friends from conversations that started from FB.
BTW, none of those forms you mentioned are ideal for more than one image at a time, so for image sharing, Facebook is vastly superior. I have a Flickr and a tumblr that hardly anyone I know personally visits, even when I send links by email. I post a link to that same page on FB, or more often just sharing the images on FB, and my images get seen and I get to share a bit of what goes on in my head with others in a way that won't make them wig out . It's a form of communication and expression as valid as blogging, scrapbooking, having a pen pal, or any one of a hundred other things people do and share with others.
I am there a little (maybe 5%) for business and mostly (95%) for keeping in contact with friends and yes even new acquaintances, and there's even a little bit of overlap from time to time, but not that often really. I'm not a tireless self-promoter, but it would be foolish to not use the shortest-distance mode that reaches the most people with the least amount of time, say, for those few times a year that I have a show, one that I worked very hard to realize, and have little chance of breaking even on.
People said telephones would destroy our humanity too. People said personal computers would destroy our humanity. Radio. Movies. Movies with sound. Television. Video games. All of them received the same kind of criticism at one point or another - that it was shallow, and vapid, and people didn't really discuss matters of importance by them, and that it winnowed away our essential humanity. Just like in any other form of interaction or communication, there's good ways to go about it and bad. Sorry it makes you bug out. For me, it's the very least of my problems, and in many ways, actually enhances my valued real-life relationships with my nearest and dearest.