I have an account but only log-in about once a month or so. Don't really "get" the whole concept, and fortunately it is just not something that really interests me.
Having said that, I must admit I recently learned about the passing of a distant relative (in terms of their relationship to me, not their distance from me, if that makes sense) via FB and I can't see how I'd have known about their death had it NOT been for FB. I went to the funeral and saw a bunch of people I'd not seen in years, possibly decades, was able to offer my sympathy to the deceased's brother, etc. I was glad I was able to attend and all there seemed to be glad to see me.
Dunno, I guess I'm kind of conflicted about the whole business of social media, but I'm also glad that it is something I seem to be able to take or leave. I know I have to stay away from things like browser-based on-line games, given how I found myself playing Ikariam just about 24/7 for six months a few years ago. Quitting that was the right thing to do, but I was in an almost physical pain for a few days after I deleted/handed off my accounts on various "worlds."
Eh, sorry for rambling.
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"The man who has fed the chicken every day throughout its life at last wrings its neck instead, showing that more refined views as to the uniformity of nature would have been useful to the chicken." ? Bertrand Russell