Yesterday a friend asked to use my computer so that he could complete a show flyer for a band. I've also added 127.0.0.1 www.facebook.com. He asked, almost cheekily, "Did _you_ do this to your computer?" -- He not being savvy enough to realize what was going on (He could have asked if the wifi hotspot we were on blocked FB, which, of course, is a wholly different, and more terrifying idea, but hey, the wifi I'm on now blocks torrentfreak.com...)Usually if someone asks, "May I use your laptop to browse Facebook?" I will tell them that I have to re-configure a few things first. This usually steers the conversation to some other direction.
Generally, I don't want sites which use Facebook "like" buttons or Facebook's comments API to complete those requests from my system.
Is this good practice? Socially or technically?