My Xperia Ray phone has just 512MB of space for Apps and came with Facebook preinstalled as a system app. I don't use Facebook, but its automatic updates kept piling up and I think it eventually ate ~50MB.
Disabling the Facebook App allowed me to uninstall the updates and today I rooted my phone, so I could fully uninstall Facebook and its add-ons. :bigsmile:
Going by the article, Facebook Home seems to require a lot of processing power (hence the high end phone requirement), so it sure makes me wonder how much it will bog the phone down or eat one's battery, not that I care. :disagree: