Facebook etiquitte

So it became clear that I couldn't leave Facebook. (*shakes fist*) Still, is it wrong to delete friends? I'd actually like to use my Facebook to keep track of people I want to keep track of. It's nightmare sorting through people you don't know, while trying to find the ones you do. Would I be wrong to trim my Facebook friends back? Only people under 25 are allowed to answer this question. The rest of us are too old.