First off, yes, you are being ridiculously stubborn for not using an incredibly useful piece of technology whose sole reason to exist is because everyone uses it. No one's putting a gun to your head and telling you to put anything up there, even a photo or your actual name. Nor does Facebook require a time investment greater than about five seconds, every other day, if all you're using it for is to keep up with plans with friends. The "it's only good if you put a lot of time into it" argument is utter horseshit, because no one's moderating every individual justification for having an account, and most of the peripheral stuff is a soulsucking third-party piece of garbage (like Zynga).
I agree that your friends are dicks for talking about events in person, with you there, and then not actually go through with the planning with everyone there. I wouldn't say they're dicks altogether for relying on planning as a standard option, because it just IS a standard option as a part of our culture. That and you can get the details adjusted and broadcast a lot more reliably and efficiently than playing phone tag for two hours trying to see if this time or that is ok with everyone else. Regardless of your prejudice, for plans that you hear about from only one or two people...you might still want to get a FB, if only for the sole purpose of making sure you have all the details.
