I was using Facebook, for a lot of reasons, but deleted my account yesterday.
I'm living fine without it. No one is forcing me to use it, and email (free! but using Mail.app and my iPhone to give it a boost I want and need–though I wouldn't mind Letters.app to appear) handles most of my needs, along with Flickr and Twitter, which are also both closed platforms.
I'm not too burdened by the software I use. I use what pleases me most. Right now that spectrum includes emacs at one end and iPhone OS at the other.
As someone pointed out above, free software fundamentalism has its place, and I respect it. But I also respect the hard work and effort that goes into software like 1Password and Things, and they both make my life a little bit better.