I really don't see the problem. If people want to share it, then let them share it. There's nearly always someone - and often lots - liking the seemingly mindless, idiotic facebook posts, so people clearly do care.
I often see my friends say something that is of absolutely no interest to me, and I wonder why the heck they're saying it. But then I realise that while I don't find it interesting, there are other friends of them who do. These people really become a lot happier from it, and it's actually a great boon for them.
And frankly, they shouldn't have to care at all that people like you and I don't care for them, because it's fun for them. And it's far, far more important that it's fun for them than that we don't particularly care for it.
I think twisting the situation might make my side more apparent. Some of my friends start political discussions on facebook, and I happily engage in those. Yet, we're very few people who actually care - the majority of my friends think such debates have no place on facebook. But I don't think any of them would go as far as to say that in consideration of them, we shouldn't be allowed to discuss it there.
In short, my point is; let people do whatever they want on facebook. They wouldn't do it if they didn't like it (with rare exceptions), and if they like it, then it's worth doing.
