I deleted mine some years ago. I still feel the sting of not connecting with a lot of acquaintances (I emigrated to another continent from where I grew up) but don't want my data aggregated and stored forever where the feds can access it at will. (Remember, the USA PATRIOT Act lets them fetch it all without a judge or warrant - and they do, 50k+ times a year.)
I have, over the course of last year felt the difficulty of not being on Facebook. This usually happens when somebody sets up an event that I would like to attend, but the invitation and accompanying information about the event is posted only to Facebook.
Another scenario is when somebody shares something published Facebook on Twitter or even on HN and you need a Facebook account to view it.
