Thanks for the responses, guys. Some interesting opinions and perspectives here.
Facebook ITSELF is one topic for discussion; my question was geared more toward the idea of using that site as a "home" where one posts all their tutorials, completed builds, etc.
What prompted my question was when I saw on another site this really nice model, and in the thread, the guys said "tutorial on how I made it look this way on my Facebook page"--and, to be honest, I was just annoyed that he didn't post it right there, and instead I would have to go hunting for him and his page. In some cases, if the guy has a relatively common name, it can be hell to try to find someone.
Now, a good friend of mine who is a well-known and very influential modeler who has done very well for himself in the hobby uses his Facebook site this way. He does it because its easier to post up on one site and not have to re-post constantly on different forums and then have to spend hours responding to questions. I can understand that. If I want to see what he's been up to lately--precisely because of his innovation and skill--I can go there and see that--but speaking for myself, I would miss the sense of community. I have a FB site with some pics of my models up there, but no techniques, and I almost never post on it, and don't accept "friends".
Roy, you had some good points, as did Gino and Rob about using it for certain projects and finding old friends in the hobby or from different branches of service.. Steve, you SHOULD be a "legend"--well, you are here on FSM for those of us who know you when you were more active. Nathan, that attitude not only exists on Facebook, it's rampant in some of the other, more "elitist" forums as well.