Just a few thoughts….
The common thread is the ability to contact minors, those 17 and under, who are permitted to have FB accounts. If it were to contact other consenting adults only or an adult only website, 18 yrs at a minimum, then this would be a non-issue.
However, because every private entity online does not validate the individual and their age who is accessing their online presence, anyone, as we have all seen, can portray themselves to be someone else and skirt the rules. The actual online entity is irrelevant, e.g. New York Times, Food Network, FB, My Space, etc, because in a digital world, anyone can access anything. Terms of Service conditions are cover your butt items required because of the stupidity of a few (e.g. frivolous lawsuits) and really don’t work overall. Society encourages full interaction among its people regardless of age, so whether you are 14 acting 18 or older or 30 acting 15, no one will really know who is on the other end. Until online entities actually can prove who the people are signing up and their intentions, really trying to stop certain people from being on your online presence is a futile effort.
Trying to stop free expression as guaranteed in our Constitution using caveats is stupid political motion. Overturn Packingham!