If you're really worried, then I'd look into using the capability of most Wi-Fi routers to limit access by MAC address.
Would love to, but even after my CAT6 project completion I will still need to support "smart" phone traffic or else pay for more data. No problem to me but my wife is constantly on hers. Same goes for my son and daughter in law when they visit (I make them use my "Clinton Email Server" guest network since they are both libs ). I also use wireless tablets to manage my entertainment systems, and then there is my Kindle. So, basically I'm going to have a "clean" non-wireless network and a "dirty" wireless network with static routes to direct them to the FaceBookNet.